[FW] Added logging

src/firmware/README.md

@@ -15,8 +15,10 @@ Each packet is constructed as follows:
 - `uint8_t`: A basic XOR checksum of all the previous bytes, XORed with `0x55`.
 - `null`: A null terminator (0x00).
 
+The firmware can also send logs by sending the initial character `/`, followed by ASCII text, then a null terminator (`0x00`)
+
 ### Commands:
-- Connect (`0x01`): Used to get the firmware into its ready state, and out of it's initial mode of repeating `WHSPAH\n`. Responds with `0x01`.
+- Connect (`0x01`): Used to get the firmware into its ready state, and out of it's initial mode of repeating `/WHSPAH\x00`. Responds with `0x01`.
 - Ping (`0x02`): Needs to be send at least once every 500ms, otherwise the firmware will reset into its initial mode. Responds with `0x02`.
 - Transmit (`0x10`): Transmits a CaiXianlin packet. The command's arguments are as follows:
     - `uint16_t`: Transmitter ID

src/firmware/WHSPAHFirmware/CommandProcessor.cpp

@@ -47,7 +47,7 @@ namespace {
         }
         checksum ^= 0x55;
         Serial.write(checksum);
-        Serial.write(0x00);
+        Serial.write((char) 0x00);
     }
 }
 
@@ -62,7 +62,8 @@ void CMDProcessor::process() {
         CMDProcessor::connected = false;
         reset();
     } else if (!CMDProcessor::connected && millis() - lastPing > 250) {
-        Serial.print("WHSPAH\n");
+        Serial.print("/WHSPAH");
+        Serial.print((char) 0x00);
         lastPing = millis();
     }
 

src/firmware/WHSPAHFirmware/Globals.cpp

@@ -2,3 +2,9 @@
 #include "./CaiXianlin.h"
 
 CaiXianlin::Transmitter* RFTransmitter = nullptr;
+
+void sendLog(char* message) {
+    Serial.write("/");
+    Serial.write(message);
+    Serial.write((char) 0x00);
+}

src/firmware/WHSPAHFirmware/Globals.h

@@ -4,5 +4,6 @@
 #include "./CaiXianlin.h"
 
 extern CaiXianlin::Transmitter* RFTransmitter;
+void sendLog(char* message);
 
 #endif // Header define