Initial commit. Working state [mostly]. :)

2 years ago · 3223d54d46
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 _build/*
 _checkouts/*
 src/config.erl
 rebar.lock
 *.ignore
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                    GNU GENERAL PUBLIC LICENSE
                       Version 3, 29 June 2007

 Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
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 For more information on this, and how to apply and follow the GNU GPL, see
 <https://www.gnu.org/licenses/>.

  The GNU General Public License does not permit incorporating your program
 into proprietary programs.  If your program is a subroutine library, you
 may consider it more useful to permit linking proprietary applications with
 the library.  If this is what you want to do, use the GNU Lesser General
 Public License instead of this License.  But first, please read
 <https://www.gnu.org/licenses/why-not-lgpl.html>.
--- a/README.md
+++ b/README.md
@ -0,0 +1,16 @@
 # `wifi` Application

 Welcome to the `wifi` AtomVM application.

 The `wifi` AtomVM application demonstrates how to configure an ESP32 device for both Station (STA) and Access Point (AP) modes, allowing an ESP32 device to join an existing WiFi network or to serve as a WiFi access point for other devices.

 For more information about programming on the AtomVM platform, see the [AtomVM Programmers Guide](https://www.atomvm.net/doc/master/programmers-guide.html).

 For general information about building and executing Erlang AtomVM example programs, see the Erlang example program [README](../README.md).

 > **IMPORTANT** If you are running this example program on a device that supports WiFi (e.g., the ESP32 or Pico W), you must first copy the `src/config.erl-template` file to set `src/config.erl` and edit the WiFi Access Point SSID and PSK to which the ESP32 device is to connect before building this application:

    sta => [
        {ssid, "my_sta_ssid"},
        {psk, "my_sta_psk"}
    ]
--- a/rebar.config
+++ b/rebar.config
@ -0,0 +1,16 @@
 {erl_opts, [debug_info]}.
 {deps, [
    {mqtt_client, {git, "https://github.com/atomvm/atomvm_mqtt_client.git", {branch, "master"}}},
    {atomvm_adc, {git, "https://github.com/atomvm/atomvm_adc.git", {branch, "master"}}}
       ]}.
 {plugins, [
    atomvm_rebar3_plugin
 ]}.
 {atomvm_rebar3_plugin, [
    {packbeam, [prune]}
 ]}.
 {profiles, [
    {check, [
        {plugins, [erlfmt]}
    ]}
 ]}.
--- a/src/airconditioner.app.src
+++ b/src/airconditioner.app.src
@ -0,0 +1,12 @@
 {application, airconditioner, [
    {description, "An AtomVM application for controlling a window air conditioner."},
    {vsn, "1.0.0"},
    {registered, []},
    {applications, [
        kernel, stdlib
    ]},
    {env, []},
    {modules, []},
    {licenses, ["GPL v3"]},
    {links, []}
 ]}.
--- a/src/airconditioner.erl
+++ b/src/airconditioner.erl
@ -0,0 +1,86 @@
 %%
 %% Copyright (c) 2024 RuhNet
 %% All rights reserved.
 %%
 %% Licensed under the GPL v3.
 %%

 -include("app.hrl").

 -module(?APPNAME).
 -behaviour(supervisor).

 -export([start/0]).
 -export([init/1]).

 -define(SERVER, ?MODULE).

 start() ->
    io:format("========================================~n"),
    io:format("==== [ RuhNet - https://ruhnet.co ] ====~n"),
    io:format("========================================~n"),
    supervisor:start_link({local, ?SERVER}, ?MODULE, []),
    timer:sleep(infinity).
    %%% if this supervisor dies, since it is linked to this main process it
    %%% will die too, and trigger a restart of the device (IF you have set
    %%% the auto-restart on exit in your AtomVM compile config.)

 init([]) ->
    io:format("Starting supervisor '~p' with ~p/~p...~n", [?MODULE, ?FUNCTION_NAME, ?FUNCTION_ARITY]),
    setup_pins(),
    util:beep(220, 200),
    util:beep(440, 600),
    util:beep(180, 100),
    util:beep(440, 200),
    util:beep(180, 50),
    MaxRestarts = 5, % Kill everyone and die if more than MaxRestarts failures per MaxSecBetweenRestarts seconds
    MaxSecBetweenRestarts = 10,
 %    Worker1 = {led, {led, start_link, []}, permanent, 2000, worker, [led]},
    Debugger = worker(debugger, start_link, []),
    LedControl = worker(led, start_link, []),
    Thermostat = worker(thermostat, start_link, []),
    TempReader = worker(temperature, start_link, []),
    ButtonWatcher = worker(button_watcher, start_link, []),
    MainControl = worker(control, start_link, []),
    NetworkSup = supervisor(network_sup, []),

    {ok, {{one_for_one, MaxRestarts, MaxSecBetweenRestarts}, [
                                                              Debugger
                                                              ,LedControl
                                                              ,TempReader
                                                              ,Thermostat
                                                              ,MainControl
                                                              %,ButtonWatcher
                                                              ,NetworkSup
                                                             ] }}.

 %Create a worker spec:
 worker(Name, StartFunc, Args) ->
    {Name, {Name, StartFunc, Args}, permanent, brutal_kill, worker, [Name]}.

 supervisor(Name, Args) ->
    {Name, {Name, start_link, Args}, permanent, brutal_kill, supervisor, [Name]}.

 setup_pins() ->
    io:format("Setting pin modes...~n"),
    setup_pins(?OUTPUT_PINS, output),
    setup_pins(?INPUT_PINS, input).
 setup_pins([Pin|RemainingPins], Mode) ->
    gpio:set_pin_mode(Pin, Mode),
    %gpio:set_direction(GPIO, Pin, Mode), %gpio:start() first for Pid of GPIO
    case Mode of
        output ->
            case lists:member(Pin, ?GENERIC_OUTPUTS) of %check if this pin is a generic output
                true ->
                    case ?GENERIC_OUTPUT_ACTIVE_LOW of
                        true -> util:set_output(Pin, high); %turn active low generic outputs OFF by setting high.
                        _ -> ok
                    end;
                _ -> ok
            end;
        _ -> ok
    end,
    setup_pins(RemainingPins, Mode);
 setup_pins([], _Mode) ->
    ok.

--- a/src/app.hrl
+++ b/src/app.hrl
@ -0,0 +1,92 @@
 %%
 %% Copyright (c) 2024 RuhNet
 %% All rights reserved.
 %%
 %% Licensed under the GPL v3.
 %%

 -define(APPNAME, airconditioner).

 -define(DEVICENAME, "greenwood_AC1").
 -define(NVS_NAMESPACE, ac).

 -define(DEBUG_ENABLED_BY_DEFAULT, console_only). % true|false|console_only|mqtt_only

 %PINS/PORTS/PERIPHERALS
 -define(COMPRESSOR_LED, 2).    %
 -define(STATUS_LED, 0).        %
 -define(STATUS_LED2, 15).      %
 -define(COMPRESSOR, 4).        %
 -define(BEEPER, 5).            %VSPI
 -define(FAN1, 25).             %
 -define(FAN2, 26).             %
 -define(FAN3, 27).             %
 -define(OUT1, 23).             %VSPI
 %-define(OUT2, 33).             %ADC1 CH5
 %-define(THERMISTOR4, 33).      %ADC1 CH5
 -define(THERMISTOR3, 32).      %ADC1 CH4
 -define(THERMISTOR1, 34).      %ADC1 CH6 INPUT ONLY
 -define(THERMISTOR2, 35).      %ADC1 CH7 INPUT ONLY
 -define(BUTTON_MODE, 18).      %VSPI
 -define(BUTTON_FAN, 19).       %VSPI
 -define(BUTTON_TEMP_UP, 36).   %INPUT ONLY
 -define(BUTTON_TEMP_DOWN, 39). %INPUT ONLY

 -define(SDA, 21).              %SDA
 -define(SCL, 22).              %SDL
 -define(SPI_MISO, 12).         %HSPI
 -define(SPI_MOSI, 13).         %HSPI
 -define(SPI_SCK, 14).          %HSPI
 -define(SPI_CS, 15).           %HSPI


 -define(GENERIC_OUTPUT_ACTIVE_LOW, true).
 -define(GENERIC_OUTPUTS, [?OUT1]).

 -define(OUTPUT_PINS, [
                      ?STATUS_LED
                      ,?STATUS_LED2
                      ,?FAN1
                      ,?FAN2
                      ,?FAN3
                      ,?COMPRESSOR
                      ,?COMPRESSOR_LED
                      ,?BEEPER
                      ,?OUT1
                     ]).

 -define(INPUT_PINS, [
                     ?THERMISTOR1
                     ,?THERMISTOR2
                     ,?BUTTON_MODE
                     ,?BUTTON_FAN
                     ,?BUTTON_TEMP_UP
                     ,?BUTTON_TEMP_DOWN
                    ]).

 %-define(MEASUREINTERVAL, 2000).
 -define(SAFETY_DELAY, 360000).
 -define(COIL_TEMP_LIMIT, 42).
 -define(THERMOSTAT_DEFAULT, <<"67">>). %BINARY integer only, not float or integer
 -define(THERMOSTAT_SPAN_DEFAULT, <<"4.0">>). %BINARY FLOAT ONLY
 -define(MIN_THERMOSTAT, 55).
 -define(MAX_THERMOSTAT, 99).
 -define(THERMOSTAT_PUB_INTERVAL_SEC, 120).
 -define(FLOAT_DECIMAL_LIMIT, 2). %format floats to this number of decimal places when converting to binary

 %MQTT Topics
 -define(TOPIC_AC, <<?DEVICENAME, "/AC">>).
 -define(TOPIC_MAIN_STATUS, <<"status">>). %shared feed shows devices connecting
 -define(TOPIC_STATUS, <<?DEVICENAME, "/status">>).
 -define(TOPIC_DEBUG, <<?DEVICENAME, "/debug">>).
 -define(TOPIC_TEMP_COIL, <<?DEVICENAME, "/coilTemp">>).
 -define(TOPIC_TEMP1, <<?DEVICENAME, "/temp1">>).
 -define(TOPIC_TEMP2, <<?DEVICENAME, "/temp2">>).
 -define(TOPIC_TEMP_OUTSIDE, <<?DEVICENAME, "/tempOutside">>).
 -define(TOPIC_FAN, <<?DEVICENAME, "/fan">>).
 %-define(TOPIC_SPAN, <<?DEVICENAME, "/span">>).
 -define(TOPIC_THERMOSTAT_SET, <<?DEVICENAME, "/thermostatSet">>).
 -define(TOPIC_THERMOSTAT, <<?DEVICENAME, "/thermostat">>).
 -define(TOPIC_OUT1, <<?DEVICENAME, "/out1">>).


--- a/src/button_watcher.erl
+++ b/src/button_watcher.erl
@ -0,0 +1,60 @@

 %%
 %% Copyright (c) 2024 RuhNet
 %% All rights reserved.
 %%
 %% Licensed under the GPL v3.
 %%

 -include("app.hrl").

 -module(button_watcher).
 -export([start_link/0, init/1]).

 start_link() ->
    io:format("Starting '~p' with ~p/~p...~n", [?MODULE, ?FUNCTION_NAME, ?FUNCTION_ARITY]),
    init([]).
    %timer:sleep(1).

 init(_) ->
    io:format("[~p:~p] Starting...~n", [?MODULE, ?FUNCTION_NAME]),
    led:flash(?STATUS_LED, 20, 20),
    %_Pid = spawn_link(?MODULE, read_buttons, []),
    %{ok, self()}.
    Pid = spawn(fun read_buttons/0),
    {ok, Pid}.

 read_buttons() ->
    case gpio:digital_read(?BUTTON_MODE) of
        low ->
            control:cycle_mode(),
            io:format("[~p:~p] Mode button (~p) pressed!~n", [?MODULE, ?FUNCTION_NAME, ?BUTTON_MODE]);
        high ->
            io:format("[~p:~p] Mode button (~p) released!~n", [?MODULE, ?FUNCTION_NAME, ?BUTTON_MODE])
    end,
    case gpio:digital_read(?BUTTON_FAN) of
        low ->
            control:cycle_fan(),
            io:format("[~p:~p] Fan button (~p) pressed!~n", [?MODULE, ?FUNCTION_NAME, ?BUTTON_FAN]);
        high ->
            io:format("[~p:~p] Fan button (~p) released!~n", [?MODULE, ?FUNCTION_NAME, ?BUTTON_FAN])
    end,
    case gpio:digital_read(?BUTTON_TEMP_UP) of
        low ->
            thermostat:up(),
            io:format("[~p:~p] Temp up button (~p) pressed!~n", [?MODULE, ?FUNCTION_NAME, ?BUTTON_TEMP_UP]);
        high ->
            io:format("[~p:~p] Temp up button (~p) released!~n", [?MODULE, ?FUNCTION_NAME, ?BUTTON_TEMP_UP])
    end,
    case gpio:digital_read(?BUTTON_TEMP_DOWN) of
        low ->
            thermostat:down(),
            io:format("[~p:~p] Temp down button (~p) pressed!~n", [?MODULE, ?FUNCTION_NAME, ?BUTTON_TEMP_DOWN]);
        high ->
            io:format("[~p:~p] Temp down button (~p) released!~n", [?MODULE, ?FUNCTION_NAME, ?BUTTON_TEMP_DOWN])
    end,
    timer:sleep(50),
    read_buttons().



--- a/src/config.erl-template
+++ b/src/config.erl-template
@ -0,0 +1,43 @@
 %%
 %% Copyright (c) 2024 RuhNet
 %% All rights reserved.
 %%
 %% Licensed under the GPL v3.
 %%

 -module(config).

 -include("app.hrl").

 %WIFI Details
 -define(WLAN_SSID, "MyNetworkSSID").
 -define(WLAN_PSK, "WifiPsswrd").
 -define(WLAN_AP_SSID, "RuhNetAirConditioner").
 -define(WLAN_AP_PSK, "WiFi_AP_Password").

 %MQTT Server Credentials
 -define(MQTT_SERVER, "mqtt.lan").
 -define(MQTT_PORT, "1883").
 -define(MQTT_USERNAME, "ruhnet_ac1").
 -define(MQTT_PASSWORD, "Pa$$w0Rd").

 -export([get/0]).

 get() ->
    #{  mqtt => #{
            url => "mqtt://" ++ ?MQTT_USERNAME ++ ":" ++ ?MQTT_PASSWORD ++ "@" ++ ?MQTT_SERVER ++ ":" ++ ?MQTT_PORT,
            username => ?MQTT_USERNAME,
            password => ?MQTT_PASSWORD
        },
        sta => [
            {dhcp_hostname, ?DEVICENAME},
            {ssid, ?WLAN_SSID},
            {psk, ?WLAN_PSK}
        ],
        ap => [
            {ssid, ?WLAN_AP_SSID},
            {psk, ?WLAN_AP_PSK},
            {ssid_hidden, false},
            {max_connections, 4}
        ]
    }.
--- a/src/control.erl
+++ b/src/control.erl
@ -0,0 +1,442 @@
 %
 %% Copyright (c) 2024 RuhNet
 %% All rights reserved.
 %%
 %% Licensed under the GPL v3.
 %%

 -include("app.hrl").

 -module(control).
 -behavior(gen_server).

 -export([start_link/0, init/1, handle_call/3, handle_cast/2, handle_info/2, terminate/2]).
 -export([set_mode/1, cycle_mode/0, set_fan/1, cycle_fan/0, set_safe/0, all_off/0 ]). %, load/0, save/0]).

 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 %%% @doc This module is the master control for the air conditioner.
 %%% State is tuple list of [
 %%%                         {mode, off|cool|energy_saver|fan_only},
 %%%                         {fan speed, 1|2|3},
 %%%                         {compressor on|off},
 %%%                         {compressor_safe, safe|wait}
 %%%                        ]
 %%% Mode 'energy_saver' turns fan on/off along with compressor, while 'on', keeps fan running constantly.
 %%% @end
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

 start_link() ->
    debugger:format("Starting '~p' with ~p/~p...~n", [?MODULE, ?FUNCTION_NAME, ?FUNCTION_ARITY]),
    {ok, _Pid} = gen_server:start_link({local, ?MODULE}, ?MODULE, [], []).

 init(_) ->
    debugger:format("Starting '~p' with ~p/~p...~n", [?MODULE, ?FUNCTION_NAME, ?FUNCTION_ARITY]),
    util:beep(880, 1000),
    %erlang:send_after(200, self(), start),
    erlang:send_after(200, ?MODULE, start),
    %set initial state:
    {ok, [{mode, off}, {fan, 3}, {compressor, off}, {compressor_safe, wait}] }.

 terminate(_Reason, _State) ->
    ok.

 handle_cast(set_safe, _State=[{mode, M}, {fan, F}, {compressor, C}, {compressor_safe, _CS}]) ->
    debugger:format("[~p:~p] overriding wait timer; setting compressor_safety: 'safe'~n", [?MODULE, ?FUNCTION_NAME]),
    spawn(fun() -> led:flash(?COMPRESSOR_LED, 50, 8) end),
    {noreply, [{mode, M}, {fan, F}, {compressor, C}, {compressor_safe, safe}] };

 handle_cast(cycle_mode, [{mode, M}, {fan, F}, {compressor, C}, {compressor_safe, CS}]) ->
    Mode = case M of
        off -> cool;
        cool -> energy_saver;
        energy_saver -> fan_only;
        fan_only -> off
    end,
    {noreply, [{mode, Mode}, {fan, F}, {compressor, C}, {compressor_safe, CS}]};

 handle_cast(cycle_fan, [{mode, M}, {fan, F}, {compressor, C}, {compressor_safe, CS}]) ->
    Fan = case F of
        1 -> 2;
        2 -> 3;
        3 -> 1
    end,
    case M of
        cool -> fan(Fan);
        fan_only -> fan(Fan);
        energy_saver -> fan(Fan);
        _ -> ok
    end,
    {noreply, [{mode, M}, {fan, Fan}, {compressor, C}, {compressor_safe, CS}]};

 handle_cast(_Msg, State) ->
    {noreply, State}.


 %%% MODE SELECTION  off|cool|energy_saver|fan_only
 handle_call({set_mode, Mode}, _From, _State=[{mode, M}, {fan, F}, {compressor, C}, {compressor_safe, CS}]) ->
    erlang:send(?MODULE, {set_mode, Mode}),
    {reply, ok, [{mode, Mode}, {fan, F}, {compressor, C}, {compressor_safe, CS}] };

 %%% FAN SELECTION 1|2|3
 handle_call({set_fan, FanNew}, _From, _State=[{mode, Mode}, {fan, F}, {compressor, C}, {compressor_safe, CS}]) ->
    erlang:send(?MODULE, {set_fan, FanNew}),
    {reply, ok, [{mode, Mode}, {fan, F}, {compressor, C}, {compressor_safe, CS}] };

 handle_call(Msg, _From, State) ->
    debugger:format("[~p] Received unknown ~p message: ~p~n", [?MODULE, ?FUNCTION_NAME, Msg]),
    {reply, ok, State}.


 handle_info(start, State) ->
    % Start first compressor safety timer
    erlang:send(?MODULE, operation_loop),
    %[{mode, M}, {fan, F}, {compressor, C}, {compressor_safe, CS}] = State,
    %debugger:format("[control] handle_info start: State=[mode:~p f:~p comp:~p cs:~p].~n", [M, F, C, CS]),
    debugger:format("[~p:~p]start Setting initial safety delay of ~p seconds...~n", [?MODULE, ?FUNCTION_NAME, trunc(?SAFETY_DELAY / 1000)]),
    fan(0), %just in case we crashed and fan is still on.
    compressor_set(off), %just in case we crashed and compressor is still on.
    erlang:send_after(?SAFETY_DELAY, ?MODULE, {compressor_safety, safe}), %mark safe after the delay has elapsed
    {noreply, State};

 handle_info({compressor_safety, CSafe}, _State=[{mode, M}, {fan, F}, {compressor, C}, {compressor_safe, _CS}]) ->
    debugger:format("[~p:~p] setting compressor_safety to: ~p~n", [?MODULE, ?FUNCTION_NAME, CSafe]),
    %io:format("[control] handle_info compressorsafety:~p. State=[mode:~p f:~p comp:~p cs:~p].~n", [CSafe, M, F, C, _CS]),
    %io:format("[control] handle_info compressorsafety NewState=[mode:~p f:~p comp:~p cs:~p].~n", [M, F, C, CSafe]),
    {noreply, [{mode, M}, {fan, F}, {compressor, C}, {compressor_safe, CSafe}] };

 %%% MODE SELECTION  off|cool|energy_saver|fan_only
 handle_info({set_mode, Mode}, _State=[{mode, M}, {fan, F}, {compressor, C}, {compressor_safe, CS}]) ->
    debugger:format("[~p:~p] changing mode from ~p to new setting: ~p~n", [?MODULE, ?FUNCTION_NAME, M, Mode]),
    {Comp, CSafe} = case Mode of
        off ->
           fan(0),
           case C of
               on -> erlang:send_after(?SAFETY_DELAY, ?MODULE, {compressor_safety, safe}),
                     {compressor_set(off), wait};
               _ -> {off, CS}
           end;
        fan_only ->
           erlang:send(?MODULE, {set_fan, fan_on(F)}),
           case C of
               on -> erlang:send_after(?SAFETY_DELAY, ?MODULE, {compressor_safety, safe}),
                     {compressor_set(off), wait};
               _ -> {off, CS}
           end;
        _ -> erlang:send(?MODULE, {set_fan, F}),
             {C, CS}
    end,
    State = [{mode, Mode}, {fan, F}, {compressor, Comp}, {compressor_safe, CSafe}],
    notify(?TOPIC_STATUS, status_binary(State, "mode_changed")),
    spawn(fun() -> util:beep(440, 100) end),
    spawn(fun() -> led:flash(?STATUS_LED, 100, 4) end),
    {noreply, State};

 %%% FAN SELECTION 1|2|3
 handle_info({set_fan, FanNew}, _State=[{mode, Mode}, {fan, FanPrev}, {compressor, C}, {compressor_safe, CS}]) ->
    F = case FanNew of %this keeps the fan selection between 1 and 3. Even if fan is off (mode off) the fan should be 1, 2, or 3
            0 ->
                fan(0),
                FanPrev;
            _NewFan ->
                spawn(fun() ->
                    timer:sleep(1000), %no reason for this other than to seem neat :)
                    fan(FanNew)
                end),
                case FanNew of
                    3 -> 3;
                    2 -> 2;
                    1 -> 1;
                    _ -> FanPrev
                end
    end,
    {noreply, [{mode, Mode}, {fan, F}, {compressor, C}, {compressor_safe, CS}] };


 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 %%% OPERATION LOOP
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 %compressor not safe (wait)
 handle_info(operation_loop, State=[{mode, Mode}, {fan, F}, {compressor, C}, {compressor_safe, wait}]) ->
    debugger:format("[~p:~p] operation_loop State=[mode:~p f:~p comp:~p cs:wait].~n", [?MODULE, ?FUNCTION_NAME, Mode, F, C]),
    case C of
        on -> compressor_set(off); %this should never happen, but if it does, we want the log message
        _ -> compressor_set_outputs(off) %silently make sure compressor is off
    end,
    case Mode of %allow fan to run even if compressor is in 'wait' stage
        cool -> fan(F);
        energy_saver ->
            debugger:format("[~p] Turning fan off since we are in energy_saver mode and compressor is off...~n", [?MODULE]),
            fan(0);
        fan_only -> fan_on(F);
        _ -> ok
    end,
    notify(?TOPIC_STATUS, status_binary(State)),
    erlang:send_after(20000, ?MODULE, operation_loop),
    {noreply, State};

 %mode is on (some form or another), and compressor is off: turn on compressor if temp/thermostat requires
 handle_info(operation_loop, [{mode, Mode}, {fan, F}, {compressor, off}, {compressor_safe, safe}] ) ->
    case Mode of %set the fan state first
        cool -> fan(F);
        fan_only -> fan(F);
        _ -> ok
    end,
    %[{temp, Temp}, {coiltemp, CoilTemp}, _, _, _] = temperature:get_temperature(),
    [{temp, Temp}, {coiltemp, CoilTemp} |_] = temperature:get_temperature(),
    [{temp, TSet}, {span, Span}] = thermostat:get_thermostat(),
    %HalfSpan = Span / 2, %CANNOT do math operations within an if/when clause!
    {TempIsHigh, _TempIsLow} = cutoff_check(Temp, TSet, Span),
    Comp = if
        TempIsHigh
        %Temp >= (TSet + HalfSpan)
        andalso Temp /= 0
        andalso ((Mode == cool) orelse (Mode == energy_saver))
        andalso ((CoilTemp > (?COIL_TEMP_LIMIT + 5))
                 orelse (CoilTemp =< 15)
                 orelse (CoilTemp == 0)
                 orelse ((CoilTemp >= 31.5) andalso (CoilTemp =< 32.5))) ->
            case Mode of
                energy_saver -> fan_on(F);
                _ -> ok
            end,
            compressor_set(on);
        true -> off
    end,
    State = [{mode, Mode}, {fan, F}, {compressor, Comp}, {compressor_safe, safe}],
    debugger:format("[~p:~p] operation_loop State=[mode:~p f:~p comp:~p cs:~p].~n", [?MODULE, ?FUNCTION_NAME, Mode, F, Comp, safe]),
    notify(?TOPIC_STATUS, status_binary(State)),
    erlang:send_after(20000, ?MODULE, operation_loop),
    {noreply, State};

 %compressor is on; regardless of mode, turn off compressor (and set safety delay), if temp requires.
 handle_info(operation_loop, [{mode, Mode}, {fan, F}, {compressor, on}, {compressor_safe, safe}]) ->
    [{temp, Temp}, {coiltemp, CoilTemp} |_] = temperature:get_temperature(),
    [{temp, TSet}, {span, Span}] = thermostat:get_thermostat(),
    %HalfSpan = Span / 2,
    {_TempIsHigh, TempIsLow} = cutoff_check(Temp, TSet, Span),
    {Comp, CS, StatusMsg} = if
        (CoilTemp =< ?COIL_TEMP_LIMIT)
                andalso ((CoilTemp =< 31.5) orelse (CoilTemp >= 32.5)) %temp sensor at 0C, (probably unplugged)
                andalso (CoilTemp >= 15) %thermistor unplugged?
                andalso (CoilTemp /= 0) ->
            compressor_set(off),
            erlang:send_after(?SAFETY_DELAY, ?MODULE, {compressor_safety, safe}),
            Msg = io_lib:format("COMPRESSOR FREEZE STOP! Coil temperature is: ~.1f", [CoilTemp]),
            spawn(fun() -> util:beep(880, 1000), util:beep(440, 1000), util:beep(880, 1000), util:beep(880, 1000) end),
            debugger:format("~p~n", [Msg]),
            {off, wait, Msg};
        %Temp =< (TSet - HalfSpan) -> %normal temp low compressor shutoff
        TempIsLow -> %normal temp low compressor shutoff
            compressor_set(off),
            erlang:send_after(?SAFETY_DELAY, ?MODULE, {compressor_safety, safe}),
            {off, wait, "thermostat compressor off"};
        true ->
            fan_on(F), %Compressor is on, so just in case, we make sure fan is also on.
            {on, safe, "ok"}
    end,
    State = [{mode, Mode}, {fan, F}, {compressor, Comp}, {compressor_safe, CS}],
    %debugger:format("[~p] ~p operation_loop T=~.2f, CT=~.2f, TS=~p, S=~.1f, State=[mode:~p f:~p comp:~p cs:~p].~n", [?MODULE, ?FUNCTION_NAME, Temp, CoilTemp,TSet, Span, Mode, F, on, safe]),
    debugger:format("[~p:~p] operation_loop State=[mode:~p f:~p comp:~p cs:~p].~n", [?MODULE, ?FUNCTION_NAME, Mode, F, Comp, CS]),
    notify(?TOPIC_STATUS, status_binary(State, StatusMsg)),
    erlang:send_after(20000, ?MODULE, operation_loop),
    {noreply, State}.

 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 %%% Convenience functions:
 %%%
 set_mode(Mode) -> % off|cool|energy_saver|fan_only
    case validate_mode(Mode) of
        invalid -> invalid_mode;
        ValidMode -> gen_server:call(?MODULE, {set_mode, ValidMode})
    end.

 set_status_led(Mode) ->
    case Mode of
        off -> util:set_output(?STATUS_LED, off);
        on -> util:set_output(?STATUS_LED, on);
        cool -> util:set_output(?STATUS_LED, on);
        energy_saver -> util:set_output(?STATUS_LED, on);
        fan_only -> util:set_output(?STATUS_LED, on);
        _ -> util:set_output(?STATUS_LED, off)
    end.

 %set_mode(Mode) -> % off|cool|energy_saver|fan_only
 %    case mode_valid(Mode) of
 %        true -> gen_server:call(?MODULE, {set_mode, Mode});
 %        _ -> invalid_mode
 %    end.

 validate_mode(Mode) ->
    case Mode of
        off -> off;
        "off" -> off;
        "OFF" -> off;
        cool -> cool;
        "cool" -> cool;
        "COOL" -> cool;
        energy_saver -> energy_saver;
        "energy_saver" -> energy_saver;
        "ENERGY_SAVER" -> energy_saver;
        fan_only -> fan_only;
        "fan_only" -> fan_only;
        "FAN_ONLY" -> fan_only;
        fan -> fan_only;
        "fan" -> fan_only;
        "FAN" -> fan_only;
        _ -> invalid
    end.


 mode_valid(Mode) ->
    case Mode of
        off -> true;
        cool -> true;
        energy_saver -> true;
        fan_only -> true;
        _ -> false
    end.

 set_fan(Fan) ->
    gen_server:call(?MODULE, {set_fan, Fan}).

 set_safe() ->
    util:beep(1000, 200),
    timer:sleep(200),
    util:beep(1000, 200),
    gen_server:cast(?MODULE, set_safe).

 cutoff_check(Temp, TSet, Span) ->
    %determine cutoff temperature based on thermostat and span size.
    %If span size is small (<3), split it evenly. If large, bias it
    %towards cooling further under the thermostat setpoint before cutting
    %off compressor.
    HalfSpan = Span/2,
    SmallPartOfSpan = Span * 0.25,
    LargePartOfSpan = Span * 0.75,
    HighPoint = case (Span < 3) of
        true -> TSet + HalfSpan;
        _ -> TSet + SmallPartOfSpan
    end,
    LowPoint = case (Span < 3) of
        true -> TSet - HalfSpan;
        _ -> TSet - LargePartOfSpan
    end,
    debugger:format("[~p:~p] Cutoff Temps: [highpoint: ~.2f lowpoint: ~.2f]~n", [?MODULE, ?FUNCTION_NAME, HighPoint, LowPoint]),
    {Temp >= HighPoint, Temp =< LowPoint}.


 %load() ->
 %    gen_server:call(?MODULE, {load}).
 %
 %save() ->
 %    gen_server:call(?MODULE, {save}).

 all_off() ->
    compressor_set(off),
    fan(0).

 compressor_set(C) ->
    debugger:format("[~p] ~p: TURNING ~p COMPRESSOR.~n", [?MODULE, ?FUNCTION_NAME, C]),
    compressor_set_outputs(C).

 compressor_set_outputs(C) ->
    util:set_output(?COMPRESSOR, C),
    util:set_output(?COMPRESSOR_LED, C),
    C.

 cycle_mode() ->
    gen_server:cast(?MODULE, cycle_mode).

 cycle_fan() ->
    gen_server:cast(?MODULE, cycle_fan).

 fan_on(F) ->
    case F of
        0 -> fan(3);
        _ -> fan(F)
    end.

 fan(F) ->
    debugger:format("Setting fan to ~p.~n", [F]),
    case util:make_int(F) of
        0 ->
            util:set_output(?FAN1, off),
            util:set_output(?FAN2, off),
            util:set_output(?FAN3, off),
            0;
        1 ->
            util:set_output(?FAN2, off), %turn off the ones that may be on before turning on the one required
            util:set_output(?FAN3, off),
            util:set_output(?FAN1, on),
            1;
        2 ->
            util:set_output(?FAN1, off),
            util:set_output(?FAN3, off),
            util:set_output(?FAN2, on),
            2;
        3 ->
            util:set_output(?FAN1, off),
            util:set_output(?FAN2, off),
            util:set_output(?FAN3, on),
            3;
        _ -> 0
    end.

 notify(Topic, Msg) ->
    case whereis(mqtt_client) of
        undefined -> io:format("MQTT is not alive; message: ~p~n", [Msg]);
        %_Pid -> spawn( fun() -> mqtt:pub(Topic, Msg) end) % this notify/2 is called from handle_call/handle_info, so need to return quickly.
        _Pid -> mqtt:publish_and_forget(Topic, Msg) % this notify/2 is called from handle_call/handle_info, so need to return quickly.
    end.

 status_binary(State) ->
    status_binary(State, "ok").

 status_binary([{mode, Mode}, {fan, Fan}, {compressor, Comp}, {compressor_safe, CS}], StatusMsg) ->
    [{temp, TStat}, {span, Span}] = thermostat:get_thermostat(),
    [{temp, _}, {coiltemp, CoilTemp}, {templocal, TempLocal}, {tempremote, TempRemote}, {tempsrc, TempSrc}] = temperature:get_temperature(),
    {{Year, Month, Day}, {Hour, Minute, Second}} = erlang:universaltime(),
    BMode = util:convert_to_binary(Mode),
    BFan = util:convert_to_binary(Fan),
    BComp = util:convert_to_binary(Comp),
    BTempLocal = util:convert_to_binary(TempLocal),
    BTempRemote = util:convert_to_binary(TempRemote),
    BTempSrc = util:convert_to_binary(TempSrc),
    BCoilTemp = util:convert_to_binary(CoilTemp),
    BTStat = util:convert_to_binary(TStat),
    BSpan = util:convert_to_binary(Span),
    BCS = util:convert_to_binary(CS),
    BTime = util:convert_to_binary(io_lib:format("~p~2..0p~2..0p ~2..0p:~2..0p:~2..0p", [ Year, Month, Day, Hour, Minute, Second ])),
    BStatusMsg = util:convert_to_binary(StatusMsg),
   <<"{"
   ,"\"mode\":\"", BMode/binary, "\","
   ,"\"fan\":", BFan/binary, ","
   ,"\"compressor\":\"", BComp/binary, "\","
   ,"\"temp_local\":", BTempLocal/binary, ","
   ,"\"temp_remote\":", BTempRemote/binary, ","
   ,"\"thermostat\":", BTStat/binary, ","
   ,"\"tempsource\":\"", BTempSrc/binary, "\","
   ,"\"span\":", BSpan/binary, ","
   ,"\"coil\":", BCoilTemp/binary, ","
   ,"\"comp_safe\":\"", BCS/binary, "\","
   ,"\"time\":\"", BTime/binary, "\","
   ,"\"status\":\"", BStatusMsg/binary, "\""
   ,"}">>.

 %status_string([{mode, Mode}, {fan, Fan}, {compressor, Comp}, {compressor_safe, CS}]) ->
 %    {Temp, TempRemote, TempSrc, CoilTemp} = temperature:get_temperature(),
 %    [{temp, TStat}, {span, Span}] = thermostat:get_thermostat(),
 %    "{"
 %    ++ "\"mode\":\"" ++ atom_to_list(Mode) ++ "\","
 %    ++ "\"fan\":" ++ integer_to_list(Fan) ++ ","
 %    ++ "\"compressor\":\"" ++ atom_to_list(Comp) ++ "\","
 %    ++ "\"temp_local\":" ++ float_to_list(Temp, [{decimals, 2}]) ++ ","
 %    ++ "\"temp_remote\":" ++ float_to_list(TempRemote, [{decimals, 2}]) ++ ","
 %    ++ "\"thermostat\":" ++ integer_to_list(TStat) ++ ","
 %    ++ "\"tempsource\":\"" ++ binary_to_list(TempSrc) ++ "\","
 %    ++ "\"span\":" ++ float_to_list(Span, [{decimals, 2}]) ++ ","
 %    ++ "\"coil\":" ++ float_to_list(CoilTemp, [{decimals, 2}]) ++ ","
 %    ++ "\"comp_safe\":\"" ++ atom_to_list(CS) ++ "\""
 %    ++ "}".


--- a/src/debugger.erl
+++ b/src/debugger.erl
@ -0,0 +1,111 @@
 %%
 %% Copyright (c) 2024 RuhNet
 %% All rights reserved.
 %%
 %% Licensed under the GPL v3.
 %%

 -include("app.hrl").

 -module(debugger).
 -behavior(gen_server).

 -export([log/1, format/1, format/2, enable/0, disable/0, mqtt_only/0, console_only/0, set_boot_time/0, uptime/0]).
 -export([start_link/0, init/1, handle_call/3, handle_cast/2, handle_info/2, terminate/2]).

 start_link() ->
    io:format("Starting ~p with ~p/~p...~n", [?MODULE, ?FUNCTION_NAME, ?FUNCTION_ARITY]),
    {ok, _Pid} = gen_server:start_link({local, ?MODULE}, ?MODULE, ?DEBUG_ENABLED_BY_DEFAULT, []).

 init(DebugStatus) ->
    io:format("~p:~p/~p called with arg: '~p'.~n", [?MODULE, ?FUNCTION_NAME, ?FUNCTION_ARITY, DebugStatus]),
    %erlang:send(self(), uptime),
    %erlang:send_after(60000, self(), time),
    {ok, {DebugStatus, erlang:universaltime()}}. %set state of default debug status and bootup time

 handle_call(enable, _From, _State={_, BootTime}) ->
    {reply, ok, {true, BootTime}};
 handle_call(disable, _From, _State={_, BootTime}) ->
    {reply, ok, {false, BootTime}};
 handle_call(console_only, _From, _State={_, BootTime}) ->
    {reply, ok, {console_only, BootTime}};
 handle_call(mqtt_only, _From, _State={_, BootTime}) ->
    {reply, ok, {mqtt_only, BootTime}};
 handle_call({set_boot_time, NewBootTime}, _From, {DebugType, _}) ->
    {reply, ok, {DebugType, NewBootTime}};
 handle_call(boot_time, _From, State={_, BootTime}) ->
    {reply, BootTime, State};
 handle_call(Call, _From, State) ->
    erlang:display(Call),
    {reply, ok, State}.

 handle_cast(Msg, State={DebugType, _}) ->
    select_output(DebugType, Msg),
    {noreply, State}.

 %handle_info(time, State) ->
 %    {{Year, Month, Day}, {Hour, Minute, Second}} = erlang:universaltime(),
 %    debugger:format("[DEBUG] Time: ~p/~2..0p/~2..0p ~2..0p:~2..0p:~2..0p ~n", [ Year, Month, Day, Hour, Minute, Second ]),
 %    erlang:send_after(60000, self(), time),
 %    {noreply, State};
 handle_info(uptime, State) ->
    {_, {{Year, Month, Day}, {Hour, Minute, Second}}} = State,
    debugger:format("BOOT TIME: ~p/~2..0p/~2..0p ~2..0p:~2..0p:~2..0p ~n", [ Year, Month, Day, Hour, Minute, Second ]),
    debugger:format("UPTIME: ~p minutes ~n",  [trunc(erlang:monotonic_time(second)/60)]),
    %erlang:send_after(900000, self(), uptime), %repeat every 15 minutes
    {noreply, State};
 handle_info(Msg, State) ->
    select_output(State, Msg),
    {noreply, State}.

 terminate(_Reason, _State) ->
    ok.

 select_output(Mode, Msg) ->
    case Mode of
        console_only ->
            %io:format("[DEBUG]: ~p~n", [Msg]);
            io:format(Msg);
        mqtt_only ->
            notify(?TOPIC_DEBUG, Msg);
        true ->
            %io:format("[DEBUG]: ~p~n", [Msg]),
            io:format(Msg),
            notify(?TOPIC_DEBUG, Msg);
        false -> ok
    end.

 notify(Topic, Msg) ->
    case whereis(mqtt_client) of
        undefined -> io:format("[DEBUG MQTT dead] MSG:~p", [Msg]);
        _Pid -> mqtt:publish_and_forget(Topic, Msg) % this notify/2 is called from handle_call/handle_info, so need to return quickly.
    end.

 enable() ->
    gen_server:call(?MODULE, enable).

 disable() ->
    gen_server:call(?MODULE, disable).

 mqtt_only() ->
    gen_server:call(?MODULE, mqtt_only).

 console_only() ->
    gen_server:call(?MODULE, console_only).

 log(Msg) ->
    gen_server:cast(?MODULE, Msg).

 format(Msg) ->
    log(Msg).

 format(FmtMsg, FmtArgs) ->
    Msg = io_lib:format(FmtMsg, FmtArgs),
    gen_server:cast(?MODULE, Msg).

 uptime() ->
    erlang:send(?MODULE, uptime).

 set_boot_time() ->
    gen_server:call(?MODULE, {set_boot_time, erlang:universaltime()}). %set state of default debug status and bootup time

--- a/src/led.erl
+++ b/src/led.erl
@ -0,0 +1,83 @@
 %%
 %% Copyright (c) 2024 RuhNet
 %% All rights reserved.
 %%
 %% Licensed under the GPL v3.
 %%

 -include("app.hrl").

 -module(led).
 -export([flash/0, flash/1, flash/2, flash/3]).
 %-export([init/1, handle_call/3, handle_info/2, terminate/2]).
 -export([start_link/0, init/1, handle_call/3, terminate/2]).

 start_link() ->
    io:format("Starting '~p' with ~p/~p...~n", [?MODULE, ?FUNCTION_NAME, ?FUNCTION_ARITY]),
    {ok, _Pid} = gen_server:start_link({local, ?MODULE}, ?MODULE, [], []).
    %timer:sleep(1).

 init(_) ->
    io:format("[~p:~p] Starting...~n", [?MODULE, ?FUNCTION_NAME]),
    flash_led(?STATUS_LED, 50, 20),
    util:set_output(?STATUS_LED, on),
    {ok, []}.

 handle_call(init, _From, State) ->
    {reply, ok, State};
 handle_call({flash, Pin, Interval, Times}, _From, State) ->
    Pid = spawn(fun() -> flash_led(Pin, Interval, Times) end),
    %{reply, ok, [Pid|State]};
    {reply, ok, State};
 handle_call(listproc, _From, State) ->
    io:format("Processes: ~p ~n", [State]),
    {reply, ok, State};
 handle_call(reset, _From, State) ->
    io:format("Processes: ~p ~n", [State]),
    kill_flashers(State),
    {reply, ok, []};
 handle_call(Call, _From, State) ->
    erlang:display(Call),
    {reply, ok, State}.

 %handle_info({gpio_interrupt, 26}, SPI) ->
 %    handle_irq(SPI),
 %    {noreply, SPI}.


 terminate(_Reason, _State) ->
    ok.

 kill_flashers(PidList) ->
    case PidList of
        [Pid|Remainder] -> exit(Pid, kill),
            kill_flashers(Remainder);
        [] -> ok;
        _ -> ok
    end.


 flash() ->
    flash(?STATUS_LED, 1000, forever).
 flash(Pin) ->
    gen_server:call(?MODULE, {flash, Pin, 1000, forever}).
 flash(Pin, Interval) ->
    io:format("Flashing Pin ~p FOREVER with interval ~p ms.~n", [Pin, Interval]),
    gen_server:call(?MODULE, {flash, Pin, Interval, forever}).
 flash(Pin, Interval, Times) ->
    io:format("Flashing Pin ~p ~p times with interval ~p ms.~n", [Pin, Times, Interval]),
    gen_server:call(?MODULE, {flash, Pin, Interval, Times}).

 flash_led(_Pin, _Interval, 0) ->
    ok;
 flash_led(Pin, Interval, forever) ->
    flash_led(Pin, Interval, 1),
    flash_led(Pin, Interval, forever);
 flash_led(Pin, Interval, Times) ->
    util:set_output(Pin, on),
    timer:sleep(Interval),
    util:set_output(Pin, off),
    timer:sleep(Interval),
    flash_led(Pin, Interval, Times-1).


--- a/src/mqtt.erl
+++ b/src/mqtt.erl
@ -0,0 +1,377 @@
 %%
 %% Copyright (c) 2024 RuhNet
 %% All rights reserved.
 %%
 %% Licensed under the GPL v3.
 %%

 -module(mqtt).
 -behavior(gen_server).

 %-export([start/0]).
 -export([start_link/0, init/1, handle_call/3, handle_cast/2, terminate/2]).
 -export([publish/2, publish/3, publish_and_forget/2, subscribe_remote_temp/1, unsubscribe/1]).

 -include("app.hrl").

 start_link() ->
    io:format("Starting '~p' with ~p/~p...~n", [?MODULE, ?FUNCTION_NAME, ?FUNCTION_ARITY]),
    {ok, _Pid} = gen_server:start_link({local, ?MODULE}, ?MODULE, [], []).
    %{ok, _Pid} = init([]).

 init(_) ->
    io:format("Starting '~p' with ~p/~p...~n", [mqtt_client, start_link, 1]),
    %{ok, {no_mqtt_pid, not_ready}}.
    My_Pid = self(),
    {ok, {My_Pid, not_ready}}.
    %{ok, MQTT_PID}.

 start_mqtt_client() ->
    Config = maps:get(mqtt, config:get()),
    MQTTConfig = #{
        url => maps:get(url, Config),
        client_id => ?DEVICENAME,
        disconnected_handler => fun(_MQTT_CLIENT_PID) -> io:format("yoyo disconnected from mqtt!!!!!!~n"), mqtt_client:reconnect(whereis(mqtt_client)) end,
        error_handler => fun(_MQTT_CLIENT_PID, Err) -> io:format("dah mqtt error_handler: ~p~n", [Err]) end,
        connected_handler => fun handle_connected/1
    },
    io:format("Starting 'mqtt_client'...~n"),
    {ok, _MQTT_PID} = mqtt_client:start_link({local, mqtt_client}, MQTTConfig).

 handle_call(start_client, _From, {_, _ReadyStatus}) ->
    io:format("MQTT Controller received 'start_client' message from 'wifi' after obtaining IP address; starting 'mqtt_client'...~n"),
    {ok, MQTT_PID} = start_mqtt_client(),
    {reply, ok, {MQTT_PID, not_ready}};
 handle_call({ready, MQTT_PID}, _From, {_, _ReadyStatus}) ->
    {reply, ok, {MQTT_PID, ready}};
 handle_call({not_ready, MQTT_PID}, _From, {_, _ReadyStatus}) ->
    {reply, ok, {MQTT_PID, not_ready}};
 handle_call({publish, Topic, Message}, _From, State) ->
    Reply = gen_server:call(?MODULE, {publish, Topic, default_qos, Message}),
    {reply, Reply, State};
 handle_call({publish, Topic, QoS, Message}, _From, State={_MQTT_PID, ReadyStatus}) ->
    case ReadyStatus of
        ready ->
            publish_message(Topic, QoS, Message),
            {reply, ok, State};
        _ -> {reply, mqtt_not_ready, State}
    end;
 handle_call(get_pid, _From, State={MQTT_PID, _ReadyStatus}) ->
    {reply, MQTT_PID, State};
 handle_call(get, _From, State={_MQTT_PID, _ReadyStatus}) ->
    {reply, State, State};
 handle_call(Msg, From, State) ->
    io:format("MQTT Controller received unknown message ~p from ~p~n", [Msg, From]),
    {reply, ok, State}.

 handle_cast({publish, Topic, Message}, State={_MQTT_PID, ReadyStatus}) -> %Fire-and-forget publish with no response
    case ReadyStatus of
        ready -> spawn(publish_and_forget(Topic, Message) );
        _ -> ReadyStatus
    end,
    {noreply, State};
 handle_cast(_Msg, State) ->
    {noreply, State}.

 terminate(_Reason, _State) ->
    ok.


 ac_on() ->
    io:format("Turning on AC.~n", []),
    util:set_output(?FAN3, on),
    util:set_output(?COMPRESSOR, on),
    util:set_output(?STATUS_LED, on),
    publish_message(?TOPIC_AC, <<"AC ON">>).

 compressor_off() ->
    io:format("Turning off compressor.~n", []),
    util:set_output(?COMPRESSOR, off),
    publish_message(?TOPIC_AC, <<"COMPRESSOR OFF">>).

 compressor_on() ->
    io:format("FORCE Turning ON compressor.~n", []),
    util:set_output(?COMPRESSOR, on),
    publish_message(?TOPIC_AC, <<"COMPRESSOR OFF">>).

 all_off() ->
    io:format("Turning off compressor.~n", []),
    util:set_output(?FAN3, off),
    util:set_output(?FAN2, off),
    util:set_output(?FAN1, off),
    util:set_output(?COMPRESSOR, off),
    publish_message(?TOPIC_AC, <<"ALL OFF">>).


 publish(Topic, Message) ->
    publish(Topic, default_qos, Message).
 publish(Topic, QoS, Message) ->
    publish_message(Topic, QoS, Message).
    %gen_server:call(?MODULE, {publish, Topic, QoS, Message}).

 publish_and_forget(Topic, Message) ->
    publish_message(Topic, at_most_once, Message).
    %gen_server:cast(?MODULE, {publish, Topic, at_most_once, Message}).

 handle_connected(MQTT) ->
    Config = mqtt_client:get_config(MQTT),
    debugger:format("[~p:~p] MQTT started and connected to ~p~n", [?MODULE, ?FUNCTION_NAME, maps:get(url, Config)]),
    gen_server:call(mqtt, {ready, MQTT}),
    subscribe_to_topic_list(MQTT, get_topics()).

 subscribe_to_topic(MQTT, Topic, SubHandleFunc, DataHandleFunc) ->
    debugger:format("Subscribing to ~p...~n", [Topic]),
    case mqtt_client:subscribe(MQTT, util:convert_to_binary(Topic), #{
        %subscribed_handler => fun handle_subscribed/2,
        %data_handler => fun handle_data/3
        subscribed_handler => SubHandleFunc,
        data_handler => DataHandleFunc
    }) of
        ok -> ok;
        _ -> io:format("MQTT Subscribe Failed! KILLING MQTT CLIENT ~p. My PID: ~p~n", [MQTT, self()]),
             exit(MQTT)
    end.

 subscribe_to_topic_list(MQTT, Topics) ->
    case Topics of
        [{Topic, SubHandleFunc, DataHandleFunc}|Remaining] ->
            subscribe_to_topic(MQTT, Topic, SubHandleFunc, DataHandleFunc),
            subscribe_to_topic_list(MQTT, Remaining);
        _ -> debugger:format("Done subscribing to MQTT topics.~n")
    end.

 get_topics() ->
    [
        {?TOPIC_AC, fun handle_subscribed/2, fun handle_data/3}
        ,{?TOPIC_THERMOSTAT, fun handle_subscribed_thermostat/2, fun handle_data_thermostat/3}
        ,{?TOPIC_OUT1, fun handle_subscribed/2, fun handle_data_output/3}
        ,{?TOPIC_FAN, fun handle_subscribed/2, fun handle_data_fan/3}
    ].

 handle_subscribed(_MQTT, Topic) ->
    debugger:format("Subscribed to topic: ~p.~n", [Topic]).

 unsubscribe(Topic) ->
    {MQTT_PID, _ReadyStatus} = gen_server:call(?MODULE, get),
    UnsubHandlerFunc = fun(_MQTT, UnsubTopic) -> debugger:format("Unsubscribed from topic feed: ~p ~n", [UnsubTopic]) end,
    debugger:format("[mqtt:unsubscribe] Running mqtt:unsubscribe in mqtt.erl to mqtt_client ~p on topic: ~p~n",[MQTT_PID, Topic]),
    mqtt_client:unsubscribe(MQTT_PID, util:convert_to_binary(Topic), #{unsubscribed_handler => UnsubHandlerFunc}).

 subscribe_remote_temp(Topic) ->
    {MQTT_PID, ReadyStatus} = gen_server:call(?MODULE, get),
    case ReadyStatus of
        ready -> subscribe_to_topic(MQTT_PID, Topic, fun handle_subscribed/2, fun handle_data_remote_temp/3);
        _ -> ReadyStatus
    end.

 handle_data_remote_temp(_MQTT, Topic, Data) ->
    debugger:format("[~p:~p/~p] remote temperature [~p] received from ~p~n", [?MODULE, ?FUNCTION_NAME, ?FUNCTION_ARITY, Data, Topic]),
    temperature:set_remote_temperature(Data).

 handle_subscribed_thermostat(_MQTT, Topic) ->
    debugger:format("Subscribed to topic: ~p.~n", [Topic]), %,
    debugger:format("Spawning thermostat setpoint publish loop on topic ~p~n", [?TOPIC_THERMOSTAT_SET]),
    spawn(fun() -> publish_thermostat_loop(?THERMOSTAT_PUB_INTERVAL_SEC * 1000) end).

 handle_data(_MQTT, Topic, Data) ->
    debugger:format("[~p:~p/~p] received data on topic ~p: ~p ~n", [?MODULE, ?FUNCTION_NAME, ?FUNCTION_ARITY, Topic, Data]),
    case Data of
        <<"flash">> -> spawn(fun() -> led:flash(?STATUS_LED, 100, 20) end);
        <<"flash2">> -> spawn(fun() -> led:flash(?STATUS_LED2, 300, 10) end);
        <<"flash 10">> -> spawn(fun() -> led:flash(?STATUS_LED, 200, 10) end);
        <<"flash forever">> -> spawn(fun() -> led:flash(?STATUS_LED, 200, forever) end);
        <<"listproc">> -> gen_server:call(led, listproc);
        <<"reset_led">> -> gen_server:call(led, reset);
        <<"beep">> -> spawn(fun() -> util:beep(440, 1000) end);
        <<"beep ", F/binary>> -> spawn(fun() -> util:beep(util:make_int(F), 1000) end);
        %%%
        <<"ac_on">> -> ac_on();
        <<"all_off">> -> all_off();
        <<"compressor_off">> -> compressor_off();
        <<"force_compressor_on">> -> compressor_on();
        %<<"coiltemp ", T/binary>> -> control:set_coil_templimit(util:make_int(T));
        %%%
        <<"sysinfo">> -> system_info:start();
        <<"uptime">> -> publish_message(?TOPIC_DEBUG, util:uptime());
        <<"debug">> -> debugger:enable(); %crashes after a few minutes
        <<"nodebug">> -> debugger:disable();
        <<"debug_mqtt_only">> -> debugger:mqtt_only();
        <<"debug_console_only">> -> debugger:console_only();
        %%%
        <<"off">> -> control:set_mode(off);
        <<"on">> -> control:set_mode(cool);
        <<"cool">> -> control:set_mode(cool);
        <<"fan_only">> -> control:set_mode(fan_only);
        <<"energy_saver">> -> control:set_mode(energy_saver);
        <<"mode_cycle">> -> control:cycle_mode();
        <<"fan_cycle">> -> control:cycle_fan();
        <<"fan ", F/binary>> -> control:set_fan(util:make_int(F));
        <<"temp_source ", TempSrc/binary>> -> temperature:set_source(TempSrc);
        <<"safe">> -> control:set_safe();
        <<"reset">> -> all_off(), esp:restart();
        <<"reboot">> -> all_off(), esp:restart();
        %%% Timer
        <<"timer_h off ", T/binary>> -> mode_timer(off, T*3600); %hours timer
        <<"timer_m off ", T/binary>> -> mode_timer(off, T*60); %minutes timer
        <<"timer_s off ", T/binary>> -> mode_timer(off, T); %seconds timer
        <<"timer off ", T/binary>> -> mode_timer(off, T);   %default seconds timer
        <<"timer_h cool ", T/binary>> -> mode_timer(cool, T*3600); %hours timer
        <<"timer_m cool ", T/binary>> -> mode_timer(cool, T*60); %minutes timer
        <<"timer_s cool ", T/binary>> -> mode_timer(cool, T); %seconds timer
        <<"timer cool ", T/binary>> -> mode_timer(cool, T);   %default seconds timer
        <<"timer_h on ", T/binary>> -> mode_timer(cool, T*3600); %hours timer
        <<"timer_m on ", T/binary>> -> mode_timer(cool, T*60); %minutes timer
        <<"timer_s on ", T/binary>> -> mode_timer(cool, T); %seconds timer
        <<"timer on ", T/binary>> -> mode_timer(cool, T);   %default seconds timer
        <<"timer_h energy_saver ", T/binary>> -> mode_timer(cool, T*3600); %hours timer
        <<"timer_m energy_saver ", T/binary>> -> mode_timer(cool, T*60); %minutes timer
        <<"timer_s energy_saver ", T/binary>> -> mode_timer(cool, T); %seconds timer
        <<"timer energy_saver ", T/binary>> -> mode_timer(cool, T);   %default seconds timer
        <<"timer_h fan_only ", T/binary>> -> mode_timer(fan_only, T*3600); %hours timer
        <<"timer_m fan_only ", T/binary>> -> mode_timer(fan_only, T*60); %minutes timer
        <<"timer_s fan_only ", T/binary>> -> mode_timer(fan_only, T); %seconds timer
        <<"timer fan_only ", T/binary>> -> mode_timer(fan_only, T);   %default seconds timer
 %        <<"timer_h ", Mode/binary, " ", T/binary>> -> %hours timer
 %            TimeMs = util:make_int(T) * 3600 * 1000,
 %            erlang:send_after(TimeMs, control, {set_mode, Mode});
 %        <<"timer_m ", Mode/binary, " ", T/binary>> -> %minutes timer
 %            TimeMs = util:make_int(T) * 60 * 1000,
 %            erlang:send_after(TimeMs, control, {set_mode, Mode});
 %        <<"timer_s ", Mode/binary, " ", T/binary>> -> %seconds timer
 %            TimeMs = util:make_int(T) * 1000,
 %            erlang:send_after(TimeMs, control, {set_mode, Mode});
 %        <<"timer ", Mode/binary, " ", T/binary>> -> %default seconds timer
 %            TimeMs = util:make_int(T) * 1000,
 %            erlang:send_after(TimeMs, control, {set_mode, Mode});
            %TimeMs = case binary:last(T) of
            %    104 ->  %h
            %    72 ->  %H
            %    109 ->  %m
            %    77 ->  %M
            %    115 ->  %s
            %    83 ->  %S
            %end,
        %%%
        _ -> util:set_output(?STATUS_LED, Data)
    end.

 handle_data_thermostat(_MQTT, Topic, Data) ->
    debugger:format("[~p:~p/~p] received data on topic ~p: ~p ~n", [?MODULE, ?FUNCTION_NAME, ?FUNCTION_ARITY, Topic, Data]),
    case Data of
        <<"+">> -> thermostat:up();
        <<"up">> -> thermostat:up();
        <<"-">> -> thermostat:down();
        <<"down">> -> thermostat:down();
        <<"show">> ->
            Res = thermostat:get_thermostat(),
            io:format("Thermostat: ~p~n", [Res]),
            publish_message(?TOPIC_THERMOSTAT_SET, Res);
        <<"span ", S/binary>> -> thermostat:set_span(S);
        <<"save">> -> thermostat:save();
        <<"load">> -> thermostat:load();
        <<"default">> -> thermostat:default();
        %%% Timer
        <<"timer_h ", Temp:2/binary, " ", T/binary>> -> thermostat_timer(Temp, util:make_int(T) * 3600); %hours timer
        <<"timer_m ", Temp:2/binary, " ", T/binary>> -> thermostat_timer(Temp, util:make_int(T) * 60); %minutes timer
        <<"timer_s ", Temp:2/binary, " ", T/binary>> -> thermostat_timer(Temp, util:make_int(T)); %seconds timer
        <<"timer ", Temp:2/binary, " ", T/binary>> -> thermostat_timer(Temp, util:make_int(T)); %seconds timer
        %%%
        _ -> thermostat:set_temp(Data),
             publish_message(?TOPIC_THERMOSTAT_SET, Data)
    end.

 mode_timer(Mode, TimeSec) ->
    T = util:make_int(TimeSec),
    spawn(fun() ->
        debugger:format("Setting mode to ~p via timer for ~p seconds from now...~n", [Mode, T]),
        erlang:send_after(T * 1000, control, {set_mode, Mode}),
        debugger:format("Changing mode to ~p via timer after ~p seconds!~n", [Mode, T])
    end).


 thermostat_timer(Temp, TimeSec) ->
    T = util:make_int(TimeSec),
    spawn(fun() ->
        debugger:format("Setting thermostat ~p timer for ~p seconds from now...~n", [Temp, T]),
        erlang:send_after(T * 1000, thermostat, {set_temp, util:make_int(Temp)}),
        debugger:format("Set thermostat to ~p with timer after ~p seconds!~n", [Temp, T])
    end).



 handle_data_fan(_MQTT, Topic, Data) ->
    debugger:format("[~p:~p/~p] received data on topic ~p: ~p ~n", [?MODULE, ?FUNCTION_NAME, ?FUNCTION_ARITY, Topic, Data]),
    case Data of
        <<"cycle">> -> control:cycle_fan();
        <<"1">> -> control:set_fan(1);
        <<"2">> -> control:set_fan(2);
        <<"3">> -> control:set_fan(3);
        F -> control:set_fan(util:make_int(F))
    end.

 %handle_data_output(_MQTT, Topic = <<"barf/out", X/binary>>, Data) ->
 handle_data_output(_MQTT, Topic, Data) ->
    debugger:format("~p/~p received data on topic ~p: ~p ~n", [?FUNCTION_NAME, ?FUNCTION_ARITY, Topic, Data]),
    %binary:last gives the last byte of a binary as an integer (ASCII value in this case). Subtract 48 to get the output number. :)
    Output = binary:last(Topic)-48,
    Pin = lists:nth(Output, ?GENERIC_OUTPUTS), %select the output pin from the ?GENERIC_OUTPUTS define list.
    SetOutFunc = case ?GENERIC_OUTPUT_ACTIVE_LOW of
                     true -> fun util:set_output_activelow/2;
                     _ -> fun util:set_output/2
                 end,
    SetOutFunc(Pin, Data).

 publish_thermostat_loop(Interval) ->
    [{temp, Therm}|_] = thermostat:get_thermostat(),
    publish_and_forget(?TOPIC_THERMOSTAT_SET, Therm),
    timer:sleep(Interval),
    publish_thermostat_loop(Interval).

 publish_message(Topic, Data) ->
    publish_message(Topic, default_qos, Data).
 publish_message(Topic, QoS, Data) ->
    publish_message(Topic, QoS, Data, 10000).

 publish_message(Topic, QoS, Data, Timeout) ->
    try
        %io:format("Publishing data '~p' to topic ~p and mqtt_client pid ~p from my Pid ~p mqtt pid:~p ~n", [Data, Topic, whereis(mqtt_client), Self, whereis(mqtt)]),
        io:format("MQTT Publishing '~p' to topic ~p~n", [Data, Topic]),
        MQTT_CLIENT = whereis(mqtt_client),
        Self = self(),
        HandlePublished = fun(MQTT2, Topic2, MsgId) ->
            %io:format("published_handler about to send pub message to PID: ~p mqtt pid ~p ~n", [Self, whereis(mqtt)]),
            Self ! published,
            handle_published(MQTT2, Topic2, MsgId)
        end,
        PublishOptions = #{qos => qos(QoS), published_handler => HandlePublished},
        Msg = util:convert_to_binary(Data),
        _ = mqtt_client:publish(MQTT_CLIENT, util:convert_to_binary(Topic), Msg, PublishOptions),
        case qos(QoS) of
            at_most_once -> ok; %don't wait for confirmation message as it won't be sent!
            _ ->
                receive
                    published ->
                        ok;
                    MessageRX -> io:format("MQTT received something else besides 'published': ~p~n", [MessageRX])
                after Timeout ->
                    io:format("Timed out waiting for publish ack~n")
                end
        end
    catch
        C:E:S ->
            io:format("Error in publish: ~p:~p~p~n", [C, E, S])
    end.

 handle_published(MQTT, Topic, MsgId) ->
    io:format("MQTT client ~p published message (with acknoledgement) to topic ~p msg_id=~p~n", [MQTT, Topic, MsgId]).

 qos(QoS) -> %allow invalid QoS value to be accepted and set to 'at_least_once'
    case QoS of
        at_least_once -> at_least_once;
        at_most_once -> at_most_once;
        exactly_once -> exactly_once;
        %_ -> at_least_once %this is the default
        _ -> at_most_once %this is the default
    end.


--- a/src/network_sup.erl
+++ b/src/network_sup.erl
@ -0,0 +1,40 @@
 %%
 %% Copyright (c) 2024 RuhNet
 %% All rights reserved.
 %%
 %% Licensed under the GPL v3.
 %%

 -module(network_sup).
 -behaviour(supervisor).

 -export([start_link/0]).
 -export([init/1]).

 -define(SERVER, ?MODULE).

 start_link() ->
    supervisor:start_link({local, ?SERVER}, ?MODULE, []).

 init([]) ->
    io:format("Starting ~p supervisor with ~p/~p...~n", [?MODULE, ?FUNCTION_NAME, ?FUNCTION_ARITY]),
    MaxRestarts = 3, % Kill everyone and die if more than MaxRestarts failures per MaxSecBetweenRestarts seconds
    MaxSecBetweenRestarts = 10,
    WiFi = worker(wifi, start_link, []),
    MQTT_Controller = worker(mqtt, start_link, []),
    %MQTTClient = worker(mqtt_client, start_link, []),
    %HTTP = worker(httpsrv, start_link, []),

    % rest_for_one restart strategy would be preferrable here but is not yet supported :)
    %{ok, {{rest_for_one, MaxRestarts, MaxSecBetweenRestarts}, [
    {ok, {{one_for_one, MaxRestarts, MaxSecBetweenRestarts}, [
                                                              MQTT_Controller %start before wifi!
                                                              ,WiFi
                                                              %,MQTTClient
                                                              %,HTTP
                                                             ] }}.

 %Create a worker spec:
 worker(Name, StartFunc, Args) ->
    {Name, {Name, StartFunc, Args}, permanent, brutal_kill, worker, [Name]}.

--- a/src/system_info.erl
+++ b/src/system_info.erl
@ -0,0 +1,95 @@

 %
 % This file is part of AtomVM.
 %
 % Copyright 2022 Fred Dushin <fred@dushin.net>
 %
 % Licensed under the Apache License, Version 2.0 (the "License");
 % you may not use this file except in compliance with the License.
 % You may obtain a copy of the License at
 %
 %    http://www.apache.org/licenses/LICENSE-2.0
 %
 % Unless required by applicable law or agreed to in writing, software
 % distributed under the License is distributed on an "AS IS" BASIS,
 % WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 % See the License for the specific language governing permissions and
 % limitations under the License.
 %
 % SPDX-License-Identifier: Apache-2.0 OR LGPL-2.1-or-later
 %

 -module(system_info).

 -export([start/0]).

 start() ->
    SystemInfo = #{
        atom_count => erlang:system_info(atom_count),
        process_count => erlang:system_info(process_count),
        port_count => erlang:system_info(port_count),
        word_size => erlang:system_info(wordsize),
        system_architecture => erlang:system_info(system_architecture)
    },
    io:format("SystemInfo:~n"),
    io:format("===========~n"),
    print_map(SystemInfo),
    io:format("~n"),

    PlatformInfo =
        case atomvm:platform() of
            esp32 ->
                #{
                    esp32_free_heap_size => erlang:system_info(esp32_free_heap_size),
                    esp32_largest_free_block => erlang:system_info(esp32_largest_free_block),
                    esp32_minimum_free_size => erlang:system_info(esp32_minimum_free_size),
                    esp32_chip_info => erlang:system_info(esp32_chip_info),
                    esp_idf_version => erlang:system_info(esp_idf_version)
                };
            _ ->
                #{}
        end,
    io:format("PlatformInfo:~n"),
    io:format("=============~n"),
    print_map(PlatformInfo),
    io:format("~n"),

    Processes = erlang:processes(),
    ProcessInfo = [{Process, get_process_info(Process)} || Process <- Processes],
    io:format("ProcessInfo:~n"),
    io:format("============~n"),
    print_process_info(ProcessInfo),
    io:format("~n"),

    ok.

 get_process_info(Pid) ->
    maps:from_list([
        erlang:process_info(Pid, heap_size),
        erlang:process_info(Pid, stack_size),
        erlang:process_info(Pid, message_queue_len),
        erlang:process_info(Pid, memory)
    ]).

 print_process_info(ProcessInfo) ->
    [
        begin
            io:format("Pid: ~p~n", [Pid]),
            print_map(Info)
        end
     || {Pid, Info} <- ProcessInfo
    ].

 print_map(Map) ->
    maps:fold(
        fun(Key, Value, _) ->
            print_entry(Key, Value)
        end,
        ok,
        Map
    ).

 print_entry(Key, Value) when is_list(Value) ->
    io:format("~p: ~s~n", [Key, Value]);
 print_entry(Key, Value) ->
    io:format("~p: ~p~n", [Key, Value]).
--- a/src/temperature.erl
+++ b/src/temperature.erl
@ -0,0 +1,167 @@
 %%
 %% Copyright (c) 2024 RuhNet
 %% All rights reserved.
 %%
 %% Licensed under the GPL v3.
 %%

 -include("app.hrl").

 -module(temperature).
 -behavior(gen_server).

 -export([get_temperature/0, set_remote_temperature/1, set_source/1]).
 -export([start_link/0, init/1, handle_call/3, handle_cast/2, handle_info/2, terminate/2]).

 start_link() ->
    debugger:format("Starting ~p with ~p/~p...~n", [?MODULE, ?FUNCTION_NAME, ?FUNCTION_ARITY]),
    {ok, _Pid} = gen_server:start_link({local, ?MODULE}, ?MODULE, [], []).

 init(_) ->
    debugger:format("[~p:~p/~p] Reading initial temperatures from thermistors on ~p and ~p...~n", [?MODULE, ?FUNCTION_NAME, ?FUNCTION_ARITY, ?THERMISTOR1, ?THERMISTOR2]),
    {ok, ADC_T1_PID} = adc:start(?THERMISTOR1),
    {ok, ADC_TCOIL_PID} = adc:start(?THERMISTOR2),
    TempSource = format_source(esp:nvs_get_binary(?NVS_NAMESPACE, temp_source, <<"local">>)),
    TempLocal = read_temp(ADC_T1_PID, thermistor1, 0.0),
    TempCoil = read_temp(ADC_TCOIL_PID, coil_thermistor, 0.0),
    erlang:send(self(), {subscribe_remote_temp, TempSource}),
    erlang:send_after(5000, self(), {tempread_loop, ADC_T1_PID, ADC_TCOIL_PID}),
    {ok, [{temp, TempLocal}, {coiltemp, TempCoil}, {templocal, TempLocal}, {tempremote, -1.0}, {tempsrc, TempSource}] }.


 handle_info({subscribe_remote_temp, TempSource}, State) ->
    case TempSource of
        local -> ok; %do nothing for local
        _ -> debugger:format("[~p:~p] subscribe_remote_temp attempting subscribe to remote source...~n", [?MODULE, ?FUNCTION_NAME]),
            case whereis(mqtt) of
                undefined ->
                    debugger:format("'mqtt' is not yet started, trying again later.~n"),
                    erlang:send_after(10000, self(), {subscribe_remote_temp, TempSource});
                _Pid -> case gen_server:call(mqtt, get) of
                            {_, ready} ->
                                mqtt:subscribe_remote_temp(TempSource);
                            _ ->
                                debugger:format("'mqtt' is running, but not ready, trying again later.~n"),
                                erlang:send_after(10000, self(), {subscribe_remote_temp, TempSource})
                        end
            end
    end,
    {noreply, State};

 handle_info({tempread_loop, ADC_T1, ADC_TCOIL}, [_, {coiltemp, TCoil}, {templocal, TLocal}, {tempremote, TRemote}, {tempsrc, TSrc}]) ->
    T1 = read_temp(ADC_T1, thermistor1, TLocal),
    Coil = read_temp(ADC_TCOIL, coil_thermistor, TCoil),
    T = temp_select(T1, TRemote, TSrc),
    %debugger:format("[~p:~p] tempread_loop [T=~.2f, TLocal=~.2f TCoil=~.2f, TRem=~p, TSrc=~p].~n", [?MODULE, ?FUNCTION_NAME, T, T1, Coil, TRemote, TSrc]),
    debugger:format("[~p:~p] tempread_loop [T=~.2f, TLocal=~.2f TCoil=~.2f, TRem=~.2f, TSrc=~p].~n", [?MODULE, ?FUNCTION_NAME, T, T1, Coil, TRemote, TSrc]),
    erlang:send_after(15000, self(), {tempread_loop, ADC_T1, ADC_TCOIL}),
    {noreply, [{temp, T}, {coiltemp, Coil}, {templocal, T1}, {tempremote, TRemote}, {tempsrc, TSrc}] }.

 %set remote temperature from external source
 handle_call({set_remote, TRemoteInput}, _From, [{temp, _}, {coiltemp, Coil}, {templocal, TLocal}, {tempremote, _}, {tempsrc, TSrc}]) ->
    TRemote = util:make_float(TRemoteInput),
    T = temp_select(TLocal, TRemote, TSrc),
    {reply, ok, [{temp, T}, {coiltemp, Coil}, {templocal, TLocal}, {tempremote, TRemote}, {tempsrc, TSrc}] };

 %set external source
 handle_call({set_source, Src}, _From, [{temp, _T}, {coiltemp, Coil}, {templocal, TLocal}, {tempremote, TRemote}, {tempsrc, OldSrc}]) ->
    Source = change_source(Src, OldSrc),
    T = temp_select(TLocal, TRemote, Source),
    {reply, ok, [{temp, T}, {coiltemp, Coil}, {templocal, TLocal}, {tempremote, TRemote}, {tempsrc, Source}] };

 handle_call(get, _From, State) ->
    {reply, State, State}.

 handle_cast(_Msg, State) ->
    {noreply, State}.

 terminate(_Reason, _State) ->
    ok.


 read_temp(ADC, Label, ErrDefaultVal) ->
    case adc:read(ADC) of
        {ok, {Raw, MilliVolts}} ->
            debugger:format("[~p:~p] Read values from ADC ~p ~p: [Raw: ~p Voltage: ~pmV]~n", [?MODULE, ?FUNCTION_NAME, ADC, Label, Raw, MilliVolts]),
            %MilliVolts/1000;
            convert_reading_to_F(MilliVolts);
        Error ->
            debugger:format("[~p:~p] Error taking reading from ADC ~p ~p: ~p~n", [?MODULE, ?FUNCTION_NAME, ADC, Label, Error]),
            ErrDefaultVal
    end.

 get_temperature() ->
    gen_server:call(?MODULE, get).

 set_remote_temperature(T) -> %set the remote temperature from MQTT or external source.
    gen_server:call(?MODULE, {set_remote, T}).
 %    if
 %        is_float(T) -> gen_server:call(?MODULE, {set_remote, T});
 %        is_integer(T) -> gen_server:call(?MODULE, {set_remote, float(T)}); %% FUNCTION float/1 DOESN'T WORK!
 %        true -> gen_server:call(?MODULE, {set_remote, -1.0})
 %    end.

 set_source(Src) ->
    gen_server:call(?MODULE, {set_source, Src}).

 change_source(NewSrc, OldSrc) ->
    BNewSrc = util:convert_to_binary(NewSrc),
    BOldSrc = util:convert_to_binary(OldSrc),
    if
        BNewSrc == BOldSrc -> %Don't write to NVS or subscribe/unsubscribe if source is unchanged.
            debugger:format("[~p:~p] Temp source is unchanged, keeping old.~n", [?MODULE, ?FUNCTION_NAME]),
            OldSrc;
        true ->
            Unsubscribed = case OldSrc of
                local -> ok;
                _ ->
                    debugger:format("[~p:~p] Unsubscribing from old source: ~p~n",[?MODULE, ?FUNCTION_NAME, OldSrc]),
                    mqtt:unsubscribe(OldSrc)
            end,
            case NewSrc of %new source is 'local' or a topic?
                local -> save_source(local);
                <<"local">> -> save_source(local);
                _ -> case Unsubscribed of
                        ok ->
                             debugger:format("[~p:~p] We are unsubscribed from old source ~p. Subscribing to new: ~p~n",[?MODULE, ?FUNCTION_NAME, OldSrc, NewSrc]),
                             case mqtt:subscribe_remote_temp(NewSrc) of
                                ok -> save_source(NewSrc); %subscription was successful, so save only then
                                Error -> Error
                             end;
                        _ -> OldSrc %revert to old source since we are still subscribed to it!
                     end
            end
    end.

 save_source(Src) ->
    case Src of
        local ->
            esp:nvs_set_binary(?NVS_NAMESPACE, temp_source, <<"local">>),
            local;
        Topic ->
            esp:nvs_set_binary(?NVS_NAMESPACE, temp_source, util:convert_to_binary(Topic)),
            Topic
    end.

 format_source(<<SrcBinary/binary>>) ->
    case SrcBinary of
        <<"local">> -> local;
        _ -> SrcBinary
    end.

 temp_select(TLocal, TRemote, TSrc) ->
    case TSrc of
        local -> TLocal;
        _ -> if
                 TRemote > 0 -> TRemote; %if remote temp is 0 (or less), use local temp until a valid value is received.
                 true -> TLocal
             end
    end.

 convert_reading_to_F(MilliVolts) ->
    %MilliVolts/21.5. %cheapo estimation!
    %MilliVolts/15.0. %cheapo estimation!
    0.038 * MilliVolts + 32.806.



--- a/src/thermostat.erl
+++ b/src/thermostat.erl
@ -0,0 +1,96 @@
 %%
 %% Copyright (c) 2024 RuhNet
 %% All rights reserved.
 %%
 %% Licensed under the GPL v3.
 %%

 -include("app.hrl").

 -module(thermostat).
 -behavior(gen_server).

 -export([up/0, down/0, get_thermostat/0, set_temp/1, set_span/1, load/0, save/0, default/0]).
 -export([start_link/0, init/1, handle_call/3, handle_cast/2, handle_info/2, terminate/2]).

 start_link() ->
    debugger:format("Starting ~p with ~p/~p...~n", [?MODULE, ?FUNCTION_NAME, ?FUNCTION_ARITY]),
    {ok, _Pid} = gen_server:start_link({local, ?MODULE}, ?MODULE, [?THERMOSTAT_DEFAULT, ?THERMOSTAT_SPAN_DEFAULT], []).

 init(Args = [DefTempBinInt, DefSpanBinFloat]) ->
    debugger:format("~p:~p/~p called with args: ~p...~n", [?MODULE, ?FUNCTION_NAME, ?FUNCTION_ARITY, Args]),
    StartTemp = esp:nvs_get_binary(?NVS_NAMESPACE, thermostat, DefTempBinInt),
    SpanDegrees = esp:nvs_get_binary(?NVS_NAMESPACE, span, DefSpanBinFloat),
    debugger:format("[~p:~p] Setting initial values. Temp: ~p Span: ~p~n", [?MODULE, ?FUNCTION_NAME, StartTemp, SpanDegrees]),
    {ok, [{temp, binary_to_integer(StartTemp)}, {span, binary_to_float(SpanDegrees)}]}.

 handle_info({set_temp, Temp}, State=[_T, Span]) ->
    if
        Temp >= ?MIN_THERMOSTAT andalso Temp =< ?MAX_THERMOSTAT ->
            {noreply, [{temp, Temp}, Span]};
        true -> {noreply, State}
    end.

 handle_call({set_temp, Temp}, _From, State=[_T, Span]) ->
    if
        Temp >= ?MIN_THERMOSTAT andalso Temp =< ?MAX_THERMOSTAT ->
            {reply, ok, [{temp, Temp}, Span]};
        true -> {reply, ok, State}
    end;
 handle_call({up}, _From, _State=[{temp, Temp}, Span]) ->
    {reply, ok, [{temp, Temp+1}, Span]};
 handle_call({down}, _From, _State=[{temp, Temp}, Span]) ->
    {reply, ok, [{temp, Temp-1}, Span]};
 handle_call({default}, _From, _State=[_T, Span]) ->
    {reply, ok, [{temp, binary_to_integer(?THERMOSTAT_DEFAULT)}, Span]};
 handle_call({load}, _From, _State=[_T, Span]) ->
    StoredTemp = esp:nvs_get_binary(?NVS_NAMESPACE, thermostat, ?THERMOSTAT_DEFAULT),
    {reply, ok, [{temp, binary_to_integer(StoredTemp)}, Span]};
 handle_call({save}, _From, State=[{temp, Temp}, {span, Span}]) ->
    debugger:format("[~p:~p] Saving current thermostat value: ~p~n", [?MODULE, ?FUNCTION_NAME, Temp]),
    esp:nvs_set_binary(?NVS_NAMESPACE, thermostat, integer_to_binary(Temp)),
    esp:nvs_set_binary(?NVS_NAMESPACE, span, float_to_binary(Span, [{decimals, 1}])),
    {reply, ok, State};
 handle_call({set_span, Span}, _From, [{temp, Temp}|_]) ->
    debugger:format("[~p:~p] Setting new span value: ~p~n", [?MODULE, ?FUNCTION_NAME, Span]),
    {reply, ok, [{temp, Temp}, {span, Span/1}]}; %divide by one forces float
 handle_call(get, _From, State) ->
    {reply, State, State};
 handle_call(Call, _From, State) ->
    debugger:log(Call),
    %erlang:display(Call),
    {reply, ok, State}.

 handle_cast(_Msg, State) ->
    {noreply, State}.

 terminate(_Reason, _State) ->
    ok.

 up() ->
    gen_server:call(?MODULE, {up}).

 down() ->
    gen_server:call(?MODULE, {down}).

 get_thermostat() ->
    gen_server:call(?MODULE, get).

 set_temp(TempInput) ->
    Temp = util:make_int(TempInput),
    gen_server:call(?MODULE, {set_temp, Temp}).

 set_span(DegreesInput) ->
    Span = util:make_float(DegreesInput),
    gen_server:call(?MODULE, {set_span, Span}).

 load() ->
    gen_server:call(?MODULE, {load}).

 save() ->
    gen_server:call(?MODULE, {save}).

 default() ->
    gen_server:call(?MODULE, {default}).


--- a/src/util.erl
+++ b/src/util.erl
@ -0,0 +1,206 @@
 %%
 %% Copyright (c) 2024 RuhNet
 %% All rights reserved.
 %%
 %% Licensed under the GPL v3.
 %%

 -include("app.hrl").

 -module(util).

 -export([ set_output/2, set_output_activelow/2, print_time/0, uptime/0, beep/2, make_int/1, make_float/1, convert_to_binary/1 ]).

 set_output(Pin, State) ->
    Level = level(State), %validate the pin state.
    case Level of
        ok -> ok;
        _ -> gpio:digital_write(Pin, Level)
    end.

 set_output_activelow(Pin, State) ->
    Level = level_reverse(level(State)), %validate the pin state.
    case Level of
        ok -> ok;
        _ -> gpio:digital_write(Pin, Level)
    end.

 print_time() ->
    %debugger:format("Printing Time with ~p...~n", [?FUNCTION_NAME]),
    {{Year, Month, Day}, {Hour, Minute, Second}} = erlang:universaltime(),
    debugger:format("Date: ~p/~2..0p/~2..0p ~2..0p:~2..0p:~2..0p (~pms)~n", [
        Year, Month, Day, Hour, Minute, Second, erlang:system_time(millisecond)
    ]),
    {{Year, Month, Day}, {Hour, Minute, Second}}.


 uptime() ->
    UptimeSec = erlang:monotonic_time(second),
    Days = trunc(UptimeSec/86400),
    Hours = case (UptimeSec > 86400) of
               true -> trunc((UptimeSec rem (Days * 86400))/3600);
               _ -> trunc(UptimeSec/3600)
           end,
    Mins = case (UptimeSec > 3600) of
              true -> trunc((UptimeSec rem (Hours * 3600))/60);
              _ -> trunc(UptimeSec/60)
        end,
    Secs = case (UptimeSec > 60) of
              true -> UptimeSec rem (Mins * 60);
              _ -> UptimeSec
        end,
    {{Y,M,D}, {H,M,S}} = erlang:universaltime(),
    Timestamp = io_lib:format("~p~2..0p~2..0p ~2..0p:~2..0p:~2..0p", [Y, M, D, H, M, S]),
    UptimeMsg = io_lib:format("~p UPTIME: ~p days, ~p hours, ~p minutes, ~p seconds",  [Timestamp, Days, Hours, Mins, Secs]),
    io:format("~p~n", [UptimeMsg]),
    UptimeMsg.


 %%% Crude beep/sound functionality
 beep(_Freq, _Duration) when (_Duration =< 1) ->
    ok;
 beep(Freq, DurationMs) ->
    CyclePeriod = 1000 / Freq, %full cycle is 2 switch time intervals
    gpio:digital_write(?BEEPER, high),
    timer:sleep(trunc(CyclePeriod / 2)),
    gpio:digital_write(?BEEPER, low),
    timer:sleep(trunc(CyclePeriod / 2)),
    beep(Freq, DurationMs - CyclePeriod). %not accurate length, but good enough

 level(State) when is_list(State) ->
    level(list_to_binary(State));
 level(State) ->
    case State of
        %on values:
        1 -> high;
        on -> high;
        high -> high;
        true -> high;
        <<"1">> -> high;
        <<"on">> -> high;
        <<"ON">> -> high;
        <<"On">> -> high;
        <<"high">> -> high;
        <<"true">> -> high;
        %off values:
        0 -> low;
        off -> low;
        low -> low;
        false -> low;
        <<"0">> -> low;
        <<"off">> -> low;
        <<"OFF">> -> low;
        <<"Off">> -> low;
        <<"low">> -> low;
        <<"false">> -> low;
        %fallback
        _ -> ok %do nothing
    end.

 level_reverse(State) ->
    case State of
        high -> low;
        low -> high
    end.


 myatom_to_binary(X) ->
    case X of
        on -> <<"on">>;
        off -> <<"off">>;
        cool -> <<"cool">>;
        fan_only -> <<"fan_only">>;
        energy_saver -> <<"energy_saver">>;
        safe -> <<"safe">>;
        wait -> <<"wait">>;
        alarm -> <<"alarm">>;
        ready -> <<"ready">>;
        not_ready -> <<"not_ready">>;
        mqtt_not_ready -> <<"mqtt_not_ready">>;
        local -> <<"local">>;
        remote -> <<"remote">>;
        low -> <<"low">>;
        high -> <<"high">>;
        true -> <<"true">>;
        false -> <<"false">>;
        yes -> <<"yes">>;
        no -> <<"no">>;
        input -> <<"input">>;
        output -> <<"output">>;
        error -> <<"error">>;
        default -> <<"default">>
    end.

 convert_to_binary(X) -> %try to convert anything to a string printable binary
    if
        is_binary(X) -> X;
        %is_atom(X) -> atom_to_binary(X); %atom_to_binary DOESN'T WORK!! (It crashes.)
        is_atom(X) -> myatom_to_binary(X);
        is_tuple(X) -> list_to_binary(io_lib:format("~p", [X]));
        is_float(X) -> float_to_binary(X, [{decimals, ?FLOAT_DECIMAL_LIMIT}]);
        is_integer(X) -> integer_to_binary(X);
        is_list(X) ->
            try
                list_to_binary(X)
            catch _ ->
                try
                    list_to_binary(io_lib:format("~p", [X]))
                catch _ ->
                    case X of
                        [Y|_] -> convert_to_binary(Y);
                        _ -> <<"">>
                    end
                end
            end;
        true -> <<"">>
    end.

 make_float(X) -> %Give back a float best you can from whatever input
    if
        X == [] -> 0.0;
        is_float(X) -> X;
        is_integer(X) -> X/1; %float(X) DOESN'T WORK, but division by one does.
        is_list(X) -> try % "68" "68.0" "abc"
                          make_float(list_to_binary(X))
                      catch _:_ ->
                                [Y|_]=X,
                                make_float(Y)
                      end;
        is_binary(X) -> try binary_to_float(X)
                        catch _:_ ->
                                  try binary_to_integer(X)
                                  catch _:_ -> 0.0
                                  end
                        end;
        true -> 0.0
    end.

 make_int(X) -> %Give back an int best you can from whatever input
    if
        is_integer(X) -> X;
        is_float(X) -> trunc(X);
        X == [] -> 0;
        is_list(X) -> try % "68" "68.0" "abc"
                          make_int(list_to_binary(X))
                      catch _:_ ->
                                [Y|_]=X,
                                make_int(Y)
                      end;
        is_binary(X) -> try binary_to_integer(X)
                        catch _:_ ->
                                  try trunc(binary_to_float(X))
                                  catch _:_ -> 0
                                  end
                        end;
        true -> 0
    end.

 %-spec to_strip_plus(kz_term:ne_binary()) -> kz_term:ne_binary().
 %to_strip_plus(Number) ->
 %    case normalize(Number) of
 %        <<$+,N/binary>> -> N;
 %        DID -> DID
 %    end.

 % ->  <<"sofia/", ?SIP_INTERFACE, "/", Contact/binary>>

--- a/src/wifi.erl
+++ b/src/wifi.erl
@ -0,0 +1,80 @@
 %%
 %% Copyright (c) 2024 RuhNet
 %% All rights reserved.
 %%
 %% Licensed under the GPL v3.
 %%

 -include("app.hrl").

 -module(wifi).

 -export([start_link/0]).

 start_link() ->
    Config = [
        {ap, [
            {ap_started, fun ap_started/0},
            {sta_connected, fun sta_connected/1},
            {sta_ip_assigned, fun sta_ip_assigned/1},
            {sta_disconnected, fun sta_disconnected/1}
            | maps:get(ap, config:get())
        ]},
        {sta, [
            {connected, fun connected/0},
            {got_ip, fun got_ip/1},
            {disconnected, fun disconnected/0}
            | maps:get(sta, config:get())
        ]},
        {sntp, [
            {host, "time-d-b.nist.gov"},
            {synchronized, fun sntp_synchronized/1}
        ]}
    ],
    case network:start_link(Config) of
        {ok, _Pid} ->
            debugger:format("Network started.~n"),
            {ok, _Pid};
            %timer:sleep(infinity);
        Error ->
            Error
    end.

 ap_started() ->
    debugger:format("AP started.~n").

 sta_connected(Mac) ->
    debugger:format("WiFi AP: Station connected with mac ~p~n", [Mac]).

 sta_disconnected(Mac) ->
    debugger:format("WiFi AP: Station ~p disconnected~n", [Mac]).

 sta_ip_assigned(Address) ->
    debugger:format("WiFi AP: Station assigned address ~p~n", [Address]).

 connected() ->
    debugger:format("WiFi Client: connected.~n").

 got_ip(IpInfo) ->
    debugger:format("WiFi Client: Using IP address: ~p.~n", [IpInfo]),
 %    network_services_sup:start_link(). %We have an IP address, so start our network dependant services supervisor
    case whereis(mqtt) of
        undefined ->
            debugger:format("MQTT CONTROLLER NOT RUNNING??~n");
        _Pid -> gen_server:call(mqtt, start_client)
    end,
    ok.

 disconnected() ->
    debugger:format("WiFi Client: disconnected.~n"),
    timer:sleep(10000),
    debugger:format("WiFi [not] killing myself because of disconnection...~n"),
    timer:sleep(1).
    %exit(kill). %kill myself (supervisor will restart) FIXME: is this best way to handle this??

 sntp_synchronized({TVSec, TVUsec}) ->
    debugger:format("Synchronized time with SNTP server. TVSec=~p TVUsec=~p~n", [TVSec, TVUsec]),
    util:print_time(),
    debugger:format("Updating system boot time..."),
    debugger:set_boot_time().