Update main_template.py

OTAA/main_template.py

@@ -30,6 +30,7 @@ pycom.rgbled(0xff0000) #red
 time.sleep(1)
 
 lora = LoRa(mode=LoRa.LORAWAN, region=LoRa.EU868, device_class=LoRa.CLASS_C)
+print('DevEUI : ', binascii.hexlify(lora.mac()).upper())
 lora.nvram_restore() #if there is nothing to restore it will return a False
 
 connect_to_ttn(lora)