Move from slow JSON to much quicker byte transfer

platformio.ini

@@ -29,5 +29,3 @@ monitor_port = /dev/ttyUSB0
 ; monitor_speed = 115200
 ; monitor_port = /dev/ttyUSB0
 
-lib_deps =
-	bblanchon/ArduinoJson @ ^6.18.3

src/BluetoothLEDCallback.cpp

@@ -1,20 +1,20 @@
-#include "JsonLightControl.cpp"
+#include "PayloadLightControl.cpp"
 #include <BLEUtils.h>
 
 class BluetoothLEDCallback : public BLECharacteristicCallbacks {
-	JsonLightControl *_lightControl;
-	std::string _json;
+	PayloadLightControl *_lightControl;
+	std::string _payload;
 
 	void onWrite(BLECharacteristic *characteristic) {
-		_json = characteristic->getValue();
-		_lightControl->action(_json);
-		characteristic->setValue(_json);
+		_payload = characteristic->getValue();
+		_lightControl->action(_payload);
+		characteristic->setValue(_payload);
 		characteristic->indicate();
 	}
 
 	public:
 
-	BluetoothLEDCallback(JsonLightControl *lightControl){
+	BluetoothLEDCallback(PayloadLightControl *lightControl){
 		_lightControl = lightControl;
 	}
 };

src/JsonLightControl.cpp

@@ -1,52 +0,0 @@
-#include "LED.cpp"
-#include "TimerManager.cpp"
-#include <map>
-#include <ArduinoJson.h>
-
-class JsonLightControl{
-	std::map<std::string, LED*> _leds;
-	TimerManager *_timers;
-
-public:
-	JsonLightControl(TimerManager *timers){
-		_timers = timers;
-	}
-
-	void registerLEDs(LED *leds){
-		_leds[leds->getName()] = leds;
-	}
-
-	void action(std::string input){
-		if (input.length() <= 0)
-			return;
-
-		StaticJsonDocument<1024> document;
-		deserializeJson(document, input.c_str());
-
-		auto lights = document.as<JsonArray>();
-
-		for (int i = 0; i < lights.size(); i++)
-		{
-			auto light = lights[i];
-
-			auto name = light["name"].as<std::string>();
-			if (!_leds.count(name))
-				continue;
-
-			auto led = _leds.find(name)->second;
-
-			auto brightness = light["brightness"].as<float>();
-			led->setBrightness(brightness);
-
-			auto on = light["on"].as<bool>();
-			if (on)
-				led->on();
-			else
-				led->off();
-
-			auto timer = light["timer"].as<unsigned long>();
-			if (timer > 0)
-				_timers->reset(name, timer);
-		}
-	}
-};

src/LEDOutput.cpp

@@ -21,6 +21,7 @@ public:
 	void attach(unsigned int pin){
 		ledcAttachPin(pin, _channel);
 	}
+
 	void writeFraction(float fraction){
 		auto value = fraction * LED_OUTPUT_PWM_RANGE;
 		if (_invert)

src/PayloadLightControl.cpp

@@ -0,0 +1,49 @@
+#include "LED.cpp"
+#include "TimerManager.cpp"
+#include <map>
+
+class PayloadLightControl{
+	std::map<int, LED*> _leds;
+	TimerManager *_timers;
+
+	unsigned long convertBytesToUnsignedLong(byte byte1, byte byte2, byte byte3, byte byte4) {
+		return (unsigned long)byte1 << 24 | (unsigned long)byte2 << 16 | (unsigned long)byte3 << 8 | (unsigned long)byte4;
+	}
+
+  public:
+	PayloadLightControl(TimerManager *timers){
+		_timers = timers;
+	}
+
+	void registerLEDs(int id, LED *leds){
+		_leds[id] = leds;
+	}
+
+	void action(std::string input){
+		if (input.length() <= 0)
+			return;
+
+		auto data = input.data();
+		for (int i = 0; i < input.length(); i += 10) {
+			byte name = data[i];
+			bool on = data[i + 1] == 1;
+			float brightness = convertBytesToUnsignedLong(data[i + 2], data[i + 3], data[i + 4], data[i + 5])/100.0f;
+			unsigned long timer = convertBytesToUnsignedLong(data[i + 6], data[i + 7], data[i + 8], data[i + 9]);
+
+			if (!_leds.count(name)) continue;
+
+			auto led = _leds.find(name)->second;
+
+			led->setBrightness(brightness);
+
+
+			if (on)
+				led->on();
+			else
+				led->off();
+
+			if (timer > 0)
+				_timers->reset(led->getName(), timer);
+		}
+	}
+};

src/main.cpp

@@ -20,8 +20,8 @@ LEDOutput _cabLedOutput(4);
 LED _cabLeds("cab", &_cabLedOutput, FADE_IN_DURATION, FADE_OUT_DURATION);
 
 TimerManager _timers;
-JsonLightControl _jsonLightControl(&_timers);
-BluetoothLEDCallback _btCallback(&_jsonLightControl);
+PayloadLightControl _payloadLightControl(&_timers);
+BluetoothLEDCallback _btCallback(&_payloadLightControl);
 BluetoothService _btService("Van Lights", &_btCallback);
 
 void setup() {
@@ -46,11 +46,11 @@ void setup() {
 	_timers.add(_awningLeds.getName(), []() { _awningLeds.off(); });
 	_timers.add(_cabLeds.getName(), []() { _cabLeds.off(); });
 
-	_jsonLightControl.registerLEDs(&_seatingLeds);
-	_jsonLightControl.registerLEDs(&_kitchenLeds);
-	_jsonLightControl.registerLEDs(&_bathroomLeds);
-	_jsonLightControl.registerLEDs(&_awningLeds);
-	_jsonLightControl.registerLEDs(&_cabLeds);
+	_payloadLightControl.registerLEDs(1, &_seatingLeds);
+	_payloadLightControl.registerLEDs(2, &_kitchenLeds);
+	_payloadLightControl.registerLEDs(3, &_bathroomLeds);
+	_payloadLightControl.registerLEDs(4, &_awningLeds);
+	_payloadLightControl.registerLEDs(5, &_cabLeds);
 
 	_btService.init();
 	_btService.start();