FiPy not connecting to MQTT with LTE CatM1

[Dylan]

Hello,

I am having trouble getting the FiPy to send messages via LTE Cat-M1. I have update the sequans, and the latest firmware for the FiPy.

According to lte.isattached and lte.isconnected everything is True.

When connecting by Wifi the MQTT message send no problems.
I have checked to make sure I have data on the SIM.

The code I have eventually returns:

Traceback (most recent call last):
File "main.py", line 42, in <module>
File "mqtt.py", line 84, in connect
IndexError: bytes index out of range

My mqtt.py code is from the pycom github unchanged.
My main.py is:

import machine
import network
import os
import time
import socket
import ssl
import pycom
from network import LTE
from mqtt import MQTTClient

def sub_cb(topic, msg):
    print(msg)
# setup as a station
lte = LTE()
print("Line 15")
lte.send_at_cmd('AT+CFUN=0')
lte.send_at_cmd('AT!="clearscanconfig"')
lte.send_at_cmd('AT!="addscanfreq band=28 dl-earfcn=9410"')
lte.send_at_cmd('AT+CGDCONT=1, "IP", "telstra.internet"')
lte.send_at_cmd('AT+CEMODE=0')
lte.send_at_cmd('AT+CEREG=2')
lte.send_at_cmd('AT+CFUN=1')

while not lte.isattached():
    print("Attaching...")
    time.sleep(0.1)
print("Attached")

lte.connect()

while not lte.isconnected():
    print("Connecting...")
    time.sleep(0.1)
    print("Connected!")
time.sleep(2)
print(lte.isconnected())
client = MQTTClient("Demo","io.adafruit.com",user="Dylan", password="xxxx", port=1883)
print("Line 38")
print(lte.isconnected())
client.set_callback(sub_cb)
print("Line 41")
client.connect()
print("Line 43")
time.sleep(3)
client.subscribe(topic="Dylan/feeds/mqtt")
print("Line 46")

while True:
    print("Sending ON")
    client.publish(topic="Dylan/feeds/mqtt", msg="ON")
    print("Line 51")
    time.sleep(1)
    print("Sending OFF")
    client.publish(topic="Dylan/feeds/mqtt", msg="OFF")
    print("Line 55")
    client.check_msg()

    time.sleep(1)

Any help would be greatly appreciated,
Cheers

[jmarcelino]

@dylan
Can you try editing mqtt.py and adding

self.sock.setBlocking(True)

after line 55
self.sock = socket.socket()

[Dylan]

@jmarcelino Gave the same error :(

[timh]

@dylan Hi Dylan. I am using MQTT constantlty over CAT-M1 on Telstra.

I am only using.

lte.send_at_cmd('AT+CGDCONT=1,"IP","telstra.internet"')
lte.send_at_cmd("AT!=\"RRC::addscanfreq band=28 dl-earfcn=9410\"")
lte.send_at_cmd('AT+CFUN=1')

And have not had to resort to the additional AT commands you are using.
I have also found the reset the modem if I have lost the connection and am reconnecting without a power cycle.

lte.send_at_cmd('AT^RESET')

Other than that its working very reliably for me.

I am not using mqtt but using the AWS client (not to connect to AWS) as I need TLS with certificate support.
We use Losant. They do support port 1883.

T