[RF69] Implement finishReceive

src/modules/RF69/RF69.cpp

@@ -122,9 +122,12 @@ int16_t RF69::transmit(const uint8_t* data, size_t len, uint8_t addr) {
   return(finishTransmit());
 }
 
-int16_t RF69::receive(uint8_t* data, size_t len) {
-  // calculate timeout (500 ms + 400 full 64-byte packets at current bit rate)
-  RadioLibTime_t timeout = 500 + (1.0f/(this->bitRate))*(RADIOLIB_RF69_MAX_PACKET_LENGTH*400.0f);
+int16_t RF69::receive(uint8_t* data, size_t len, RadioLibTime_t timeout) {
+  RadioLibTime_t timeoutInternal = timeout;
+  if(!timeoutInternal) {
+    // calculate timeout (500 ms + 400 full 64-byte packets at current bit rate)
+    timeoutInternal = 500 + (1.0f/(this->bitRate))*(RADIOLIB_RF69_MAX_PACKET_LENGTH*400.0f);
+  } 
 
   // start reception
   int16_t state = startReceive();
@@ -135,9 +138,7 @@ int16_t RF69::receive(uint8_t* data, size_t len) {
   while(!this->mod->hal->digitalRead(this->mod->getIrq())) {
     this->mod->hal->yield();
 
-    if(this->mod->hal->millis() - start > timeout) {
-      standby();
-      clearIRQFlags();
+    if(this->mod->hal->millis() - start > timeoutInternal) {
       return(RADIOLIB_ERR_RX_TIMEOUT);
     }
   }

src/modules/RF69/RF69.h

@@ -528,11 +528,13 @@ class RF69: public PhysicalLayer {
     /*!
       \brief Blocking binary receive method.
       Overloads for string-based transmissions are implemented in PhysicalLayer.
-      \param data Binary data to be sent.
-      \param len Number of bytes to send.
+      \param data Pointer to array to save the received binary data.
+      \param len Number of bytes that will be received. Must be known in advance for binary transmissions.
+      \param timeout Reception timeout in milliseconds. If set to 0,
+      timeout period will be calculated automatically based on the radio configuration.
       \returns \ref status_codes
     */
-    int16_t receive(uint8_t* data, size_t len) override;
+    int16_t receive(uint8_t* data, size_t len, RadioLibTime_t timeout = 0) override;
 
     /*!
       \brief Sets the module to sleep mode.