added free memory to device status query

README.md

@@ -138,9 +138,10 @@ Hereafter described is the default *plain* format, which uses MSB bit numbering.
 
 **Port #2:** Device status query result
 
-  	byte 1-2:	Battery or USB Voltage [mV], 0 if unreadable
+  	byte 1-2:	Battery or USB Voltage [mV], 0 if no battery probe
 	byte 3-10:	Uptime [seconds]
 	bytes 11-14: 	CPU temperature [°C]
+	bytes 15-18:	Free RAM [bytes]
 
 **Port #3:** Device configuration query result
 

src/TTN/packed_decoder.js

@@ -18,7 +18,7 @@ function Decoder(bytes, port) {
 
     if (port === 2) {
         // device status data
-        return decode(bytes, [uint16, uptime, temperature], ['voltage', 'uptime', 'cputemp']);
+        return decode(bytes, [uint16, uptime, temperature, uint32], ['voltage', 'uptime', 'cputemp', 'memory']);
     }
 
 
@@ -66,7 +66,7 @@ uptime.BYTES = 4;
 
 var uint8 = function (bytes) {
     if (bytes.length !== uint8.BYTES) {
-        throw new Error('int must have exactly 1 byte');
+        throw new Error('uint8 must have exactly 1 byte');
     }
     return bytesToInt(bytes);
 };
@@ -74,12 +74,20 @@ uint8.BYTES = 1;
 
 var uint16 = function (bytes) {
     if (bytes.length !== uint16.BYTES) {
-        throw new Error('int must have exactly 2 bytes');
+        throw new Error('uint16 must have exactly 2 bytes');
     }
     return bytesToInt(bytes);
 };
 uint16.BYTES = 2;
 
+var uint32 = function (bytes) {
+    if (bytes.length !== uint32.BYTES) {
+        throw new Error('uint32 must have exactly 4 bytes');
+    }
+    return bytesToInt(bytes);
+};
+uint32.BYTES = 4;
+
 var latLng = function (bytes) {
     if (bytes.length !== latLng.BYTES) {
         throw new Error('Lat/Long must have exactly 4 bytes');

src/payload.cpp

@@ -53,7 +53,7 @@ void PayloadConvert::addConfig(configData_t value) {
 }
 
 void PayloadConvert::addStatus(uint16_t voltage, uint64_t uptime,
-                               float cputemp) {
+                               float cputemp, uint32_t mem) {
   uint32_t temp = (uint32_t)cputemp;
   buffer[cursor++] = highByte(voltage);
   buffer[cursor++] = lowByte(voltage);
@@ -69,6 +69,10 @@ void PayloadConvert::addStatus(uint16_t voltage, uint64_t uptime,
   buffer[cursor++] = (byte)((temp & 0x00FF0000) >> 16);
   buffer[cursor++] = (byte)((temp & 0x0000FF00) >> 8);
   buffer[cursor++] = (byte)((temp & 0x000000FF));
+  buffer[cursor++] = (byte)((mem & 0xFF000000) >> 24);
+  buffer[cursor++] = (byte)((mem & 0x00FF0000) >> 16);
+  buffer[cursor++] = (byte)((mem & 0x0000FF00) >> 8);
+  buffer[cursor++] = (byte)((mem & 0x000000FF));
 }
 
 #ifdef HAS_GPS
@@ -124,10 +128,11 @@ void PayloadConvert::addConfig(configData_t value) {
 }
 
 void PayloadConvert::addStatus(uint16_t voltage, uint64_t uptime,
-                               float cputemp) {
+                               float cputemp, uint32_t mem) {
   writeUint16(voltage);
   writeUptime(uptime);
   writeTemperature(cputemp);
+  writeUint32(mem);
 }
 
 #ifdef HAS_GPS
@@ -159,6 +164,8 @@ void PayloadConvert::writeLatLng(double latitude, double longitude) {
   intToBytes(cursor, longitude, 4);
 }
 
+void PayloadConvert::writeUint32(uint32_t i) { intToBytes(cursor, i, 4); }
+
 void PayloadConvert::writeUint16(uint16_t i) { intToBytes(cursor, i, 2); }
 
 void PayloadConvert::writeUint8(uint8_t i) { intToBytes(cursor, i, 1); }
@@ -239,7 +246,7 @@ void PayloadConvert::addConfig(configData_t value) {
 }
 
 void PayloadConvert::addStatus(uint16_t voltage, uint64_t uptime,
-                               float celsius) {
+                               float celsius, uint32_t mem) {
   uint16_t temp = celsius * 10;
   uint16_t volt = voltage / 10;
 #ifdef HAS_BATTERY_PROBE

src/payload.h

@@ -35,7 +35,7 @@ public:
   uint8_t *getBuffer(void);
   void addCount(uint16_t value1, uint16_t value2);
   void addConfig(configData_t value);
-  void addStatus(uint16_t voltage, uint64_t uptime, float cputemp);
+  void addStatus(uint16_t voltage, uint64_t uptime, float cputemp, uint32_t mem);
   void addAlarm(int8_t rssi, uint8_t message);
 #ifdef HAS_GPS
   void addGPS(gpsStatus_t value);
@@ -59,6 +59,7 @@ private:
   void intToBytes(uint8_t pos, int32_t i, uint8_t byteSize);
   void writeUptime(uint64_t unixtime);
   void writeLatLng(double latitude, double longitude);
+  void writeUint32(uint32_t i);
   void writeUint16(uint16_t i);
   void writeUint8(uint8_t i);
   void writeHumidity(float humidity);

src/rcommand.cpp

@@ -304,7 +304,7 @@ void get_status(uint8_t val[]) {
   uint16_t voltage = 0;
 #endif
   payload.reset();
-  payload.addStatus(voltage, uptime() / 1000, temperatureRead());
+  payload.addStatus(voltage, uptime() / 1000, temperatureRead(), ESP.getFreeHeap());
   SendData(STATUSPORT);
 };
 
@@ -350,6 +350,7 @@ void rcommand(uint8_t cmd[], uint8_t cmdlength) {
   bool storeflag = false;
 
   while (cursor < cmdlength) {
+
     int i = cmdtablesize;
     while (i--) {
       if (cmd[cursor] == table[i].opcode) { // lookup command in opcode table
@@ -368,36 +369,11 @@ void rcommand(uint8_t cmd[], uint8_t cmdlength) {
               "Remote command x%02X called with missing parameter(s), skipped",
               table[i].opcode);
         break; // exit table lookup loop, command was found
-      }        // lookup command
+      }        // command validation
-    }          // while loop table lookup
+    }          // command table lookup loop
-  }            // while loop parsing cmd
+
+  } // command parsing loop
 
   if (storeflag)
     saveConfig();
 } // rcommand()
-
-/*
-
-// check and execute remote command
-void rcommand(uint8_t cmd[], uint8_t cmdlength) {
-
-  if (cmdlength == 0)
-    return;
-  else
-    cmdlength--; // minus 1 byte for opcode
-
-  int i = cmdtablesize;
-  while (i--) {
-    if ((cmd[0] == table[i].opcode) &&
-        (table[i].params == cmdlength)) { // lookup command in opcode table
-      memmove(cmd, cmd + 1,
-              cmdlength); // strip opcode from cmd array
-      table[i].func(cmd); // execute assigned function with given parameters
-      if (table[i].store) // ceck if function needs to store configuration
-        saveConfig();
-      break; // exit while loop, command was found
-    }        // lookup command
-  }          // while
-
-} // rcommand()
-*/