RF69 - Fixed string processing in receive method

src/modules/RF69.cpp

@@ -145,8 +145,19 @@ uint8_t RF69::receive(uint8_t* data, size_t len) {
   size_t length = _mod->SPIreadRegister(RF69_REG_FIFO);
   
   // read packet data
+  if(len == 0) {
+    // argument len equal to zero indicates String call, which means dynamically allocated data array
+    // dispose of the original and create a new one
+    delete[] data;
+    data = new uint8_t[length];
+  }
   _mod->SPIreadRegisterBurst(RF69_REG_FIFO, length, data);
   
+  // add terminating null
+  if(len == 0) {
+    data[length] = 0;
+  }
+  
   // clear interrupt flags
   clearIRQFlags();
   
@@ -155,12 +166,11 @@ uint8_t RF69::receive(uint8_t* data, size_t len) {
 
 uint8_t RF69::receive(String& str, size_t len) {
   // create temporary array to store received data
-  char* data = new char[0];
+  char* data = new char[len];
   uint8_t state = RF69::receive((uint8_t*)data, len);
   
   // if packet was received successfully, copy data into String
   if(state == ERR_NONE) {
-    data[strlen(data) - 1] = 0;
     str = String(data);
   }