Method sendACK

RFM69.cpp:372–387

should be called immediately after reception in case sender wants ACK

// should be called immediately after reception in case sender wants ACK
void RFM69::sendACK(const void* buffer, uint8_t bufferSize) {
  ACK_REQUESTED = 0;   // TWS added to make sure we don't end up in a timing race and infinite loop sending Acks
  uint16_t sender = SENDERID;
  int16_t _RSSI = RSSI; // save payload received RSSI value
  writeReg(REG_PACKETCONFIG2, (readReg(REG_PACKETCONFIG2) & 0xFB) | RF_PACKET2_RXRESTART); // avoid RX deadlocks
  uint32_t now = millis();
  while (!canSend() && millis() - now < RF69_CSMA_LIMIT_MS){
      receiveDone();
#ifdef ESP8266
      delay(1); // Give esp8266-based boards to handle background tasks. Seems to work better than yield().
#endif
  }
  SENDERID = sender;    // TWS: Restore SenderID after it gets wiped out by receiveDone()
  sendFrame(sender, buffer, bufferSize, false, true);
  RSSI = _RSSI; // restore payload RSSI
}

// internal function
void RFM69::sendFrame(uint16_t toAddress, const void* buffer, uint8_t bufferSize, bool requestACK, bool sendACK) {