pytrack GPS coordinate give a failure to lorawan downlink message

  • My System:
    (sysname='LoPy', nodename='LoPy', release='1.8.0.b1', version='v1.8.6-760-g90b72952 on 2017-09-01', machine='LoPy with ESP32', lorawan='1.0.0')
    pytrack fw 0.0.4

    My fault

    """ OTAA Node example compatible with the LoPy Nano Gateway """

    from network import LoRa
    import socket
    import binascii
    import struct
    import time
    import config
    import time
    import gc
    from machine import Timer
    from L76GNSS import L76GNSS
    from pytrack import Pytrack
    from network import LoRa
    import pycom

    #initialize LoRa in LORAWAN mode.

    lora = LoRa(mode=LoRa.LORAWAN)

    #create an OTA authentication params

    dev_eui = binascii.unhexlify('00 00 00 00 00 00 00 05'.replace(' ',''))
    app_eui = binascii.unhexlify('00 00 00 00 00 00 00 05'.replace(' ',''))
    app_key = binascii.unhexlify('AA AA AA AA AA AA AA AA AA AA AA AA AA AA AA AA'.replace(' ',''))

    #set the 3 default channels to the same frequency (must be before sending the OTAA join request)

    lora.add_channel(0, frequency=config.LORA_FREQUENCY, dr_min=0, dr_max=5)
    lora.add_channel(1, frequency=config.LORA_FREQUENCY, dr_min=0, dr_max=5)
    lora.add_channel(2, frequency=config.LORA_FREQUENCY, dr_min=0, dr_max=5)

    #join a network using OTAA

    lora.join(activation=LoRa.OTAA, auth=(dev_eui, app_eui, app_key), timeout=0, dr=config.LORA_NODE_DR)


    #wait until the module has joined the network

    while not lora.has_joined():
    print('Not joined yet...')
    print('Joined now')

    #remove all the non-default channels

    for i in range(3, 16):

    #create a LoRa socket

    s = socket.socket(socket.AF_LORA, socket.SOCK_RAW)

    #set the LoRaWAN data rate

    s.setsockopt(socket.SOL_LORA, socket.SO_DR, config.LORA_NODE_DR)

    #make the socket blocking



    #Enable garbage collection


    #Set up GPS with modest timeout

    py = Pytrack()
    l76 = L76GNSS(py, timeout=30)

    chrono = Timer.Chrono()

    while True:
    coord = l76.coordinates() ## Gets coordinates
    if not coord == (None, None):
    lat, lon = coord
    print(lat, lon)
    print("No coordinates found")
    s.send(b''+str(lat)+','+str(lon)) ## Send last known coordinates
    print("messge sent")
    rx, port = s.recvfrom(256)
    if rx:
    print('Received: {}, on port: {}'.format(rx, port))

    If I comment "coord = l76.coordinates()" line node receive downlink message, otherwise messages remain in server queue and never arrive to node.
    Can anyone help me to solve this problem?

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