from pyLoraRFM9x import LoRa, ModemConfig
import serial

addr = '/tmp/virttty'
conn = serial.serial_for_url(addr)

# This is our callback function that runs when a message is received
def on_recv(payload):
    print("From:", payload.header_from)
    print("Received:", payload.message)
    print("RSSI: {}; SNR: {}".format(payload.rssi, payload.snr))
    conn.write(payload.message)


# Use chip select 1. GPIO pin 5 will be used for interrupts and set reset pin to 25
# The address of this device will be set to 2
lora = LoRa(1, 5, 2, reset_pin = 25, modem_config=ModemConfig.Bw125Cr45Sf128, tx_power=14, acks=True)
lora.on_recv = on_recv

# Send a message to a recipient device with address 10
# Retry sending the message twice if we don't get an  acknowledgment from the recipient
while True:
    message = conn.readline()
    if message != '':
        print("new messsage:", message)
        status = lora.send_to_wait(message, 10, retries=2)
        if status is True:
            print("Message sent!")
        else:
            print("No acknowledgment from recipient")