LoPy LoRa range test - listener

main.py

# Benjamin Chodroff, 2017
# This is the main listening gateway
# It's job is to receive LoRa messages and, if a color, set the LED to that color 
# Otherwise, it will set unknown messages or errors as "white"
import machine
button=machine.Pin("G17",machine.Pin.IN, pull=machine.Pin.PULL_UP)
led=machine.Pin("G16", machine.Pin.OUT)
led.value(1)
    #If the dev button is not pressed (0) then run this device in broadcast mode
if button():
    led.value(0)
    import node1
    print(str(node1.DEVICE_ID))
    print("failure")
else:
    led.value(1)
    import socket
    import struct
    from network import LoRa
    import time
    import pycom
    pycom.heartbeat(False)
    pycom.rgbled(0xffffff) #white
    time.sleep(1)
    # A basic package header, B: 1 byte for the deviceId, B: 1 byte for the pkg size, %ds: Formated string for string
    _LORA_PKG_FORMAT = "!BB%ds"
    # A basic ack package, B: 1 byte for the deviceId, B: 1 bytes for the pkg size, B: 1 byte for the Ok (200) or error messages
    _LORA_PKG_ACK_FORMAT = "BBB"

    # Open a LoRa Socket, use rx_iq to avoid listening to our own messages
    lora = LoRa(mode=LoRa.LORA, rx_iq=True, tx_power=14, power_mode=LoRa.ALWAYS_ON, public=True, tx_retries=1)
    lora_sock = socket.socket(socket.AF_LORA, socket.SOCK_RAW)
    lora_sock.setblocking(False)

    while (True):
        try:
            recv_pkg = lora_sock.recv(512)
            if (len(recv_pkg) > 2):
                recv_pkg_len = recv_pkg[1]
                device_id, pkg_len, msg = struct.unpack(_LORA_PKG_FORMAT % recv_pkg_len, recv_pkg)
                # If the uart = machine.UART(0, 115200) and os.dupterm(uart) are set in the boot.py this print should appear in the serial port
                print('Device: %d - Pkg:  %s' % (device_id, msg))
                ack_pkg = struct.pack(_LORA_PKG_ACK_FORMAT, device_id, 1, 200)
                lora_sock.send(ack_pkg)
                pycom.rgbled(int(msg))
                time.sleep(0.1)
        except:
            print("exception encountered")
            pycom.rgbled(0xffffff) #white
            time.sleep(1)