Add Rx Data output

src/main.cpp

@@ -244,9 +244,15 @@ void onEvent(ev_t ev) {
             if (LMIC.txrxFlags & TXRX_ACK)
                 Serial.println(F("Received ack"));
             if (LMIC.dataLen) {
-                Serial.println(F("Received "));
-                Serial.println(LMIC.dataLen);
-                Serial.println(F(" bytes of payload"));
+                Serial.print(F("Received "));
+                Serial.print(LMIC.dataLen);
+                Serial.print(F(" bytes of payload: "));
+                for (int i = 0; i < LMIC.dataLen; i++) {
+                    if (LMIC.frame[LMIC.dataBeg + i] < 0x10) { Serial.print(F("0")); }
+                    Serial.print(LMIC.frame[LMIC.dataBeg + i], HEX);
+                    Serial.print(F(" "));
+                }
+                Serial.println(F(""));
             }
             // Schedule next transmission
             os_setTimedCallback(&sendjob, os_getTime() + sec2osticks(TX_INTERVAL), do_send);