[Firmware] Added Beacon Mode

Firmware/platformio.ini

@@ -1,7 +1,6 @@
 [env:attiny84]
 platform = atmelavr
 board = attiny84
-platform = atmelavr
 framework = arduino
 upload_protocol = stk500v2
 upload_flags =

Firmware/src/main.cpp

@@ -1,5 +1,5 @@
 /*
-  main.cpp - TinyLora BMP280 Firmware
+  main.cpp - TinyLora / TinyTX Firmware
   Copyright (c) 2019, Stefan Brand
   All rights reserved.
 
@@ -66,6 +66,16 @@
 // Global Variable used for deep sleep
 uint16_t sleep_interval;
 
+void blink(uint8_t num) {
+  pinMode(LED_PIN, OUTPUT);
+  digitalWrite(LED_PIN, 0);
+  for (uint8_t i=0; i<num*2; i++) {
+    digitalWrite(LED_PIN, !digitalRead(LED_PIN));
+    delay(100);
+  }
+  digitalWrite(LED_PIN, 0);
+}
+
 // Setup Wakeup Interrupt Timer
 void init_wdt()
 {
@@ -137,32 +147,38 @@ void setup()
     radio.setPowerLevel(RFM69_TXPOWER);
     radio.sleep();
   #endif
-
   // Setup LED if defined
   #ifdef LED_PIN
     pinMode(LED_PIN, OUTPUT);
+    blink(1);
   #endif
-  delay(50);
 }
 
 
 void loop()
 {
-  // Buffer to send data
-  int32_t data[4];
+  // Without Sensor (Beacon Mode) just send the Battery Voltage
+  #ifdef HAS_NO_SENSOR
+    int32_t data[1];
+  #endif
 
   // Get Sensor Data
   #ifdef HAS_BME280
+    int32_t data[4] = {0, 0, 0, 0};
     sensor.getData(&data[0], &data[1], &data[2]);
   #endif
 
   #ifdef HAS_SHT21
+    int32_t data[4] = {0, 0, 0, 0};
     data[0] = (int32_t)(sensor.getTemperature()*100);
-    data[1] = 0;
     data[2] = (int32_t)(sensor.getHumidity()*100);
   #endif
   
-  data[3] = readVcc();
+  #ifdef HAS_NO_SENSOR
+    data[0] = readVcc();
+  #else
+    data[3] = readVcc();
+  #endif
 
   // LED On before Sending
   #ifdef LED_PIN