@jmarcelino said in General LTE-M (Cat M1) connection problems thread:
So specific issues don't get mixed up or lost in one thousands other threads I'm starting this thread to collect all general issues with Cat M1 connections.
Please post your connection reports here if you have problems connecting to a public Cat M1 network.
Please include at a minimum operator, country, SIM card used
It would help if you know the APN and frequency bands used
If you have a more specific issue, e.g. using an LTE simulator please post a new thread.
Thank you
Country= Mexico
I use Fipy LTE-M
SIM CARD=Vasanta
Operator= Vasanta.
I used this code:
import time
from machine import RTC
from network import LTE
NTP_SERVER = "au.pool.ntp.org"
#Need to use global variables.
#If in each function you delare a new reference, functionality is broken
lte = LTE()
rtc = RTC()
#Returns a network.LTE object with an active Internet connection.
def getLTE():
# If already used, the lte device will have an active connection.
# If not, need to set up a new connection.
if lte.isconnected():
return lte
#Modem does not connect successfully without first being reset.
print("Resetting LTE modem ... ", end='')
lte.send_at_cmd('AT^RESET')
print("OK")
time.sleep(1)
#While the configuration of the CGDCONT register survives resets,
#the other configurations don't. So just set them all up every time.
print("Configuring LTE ", end='')
lte.send_at_cmd('AT+CGDCONT=1,"IP","telstra.internet"')
print(".", end='')
lte.send_at_cmd('AT!="RRC::addscanfreq band=28 dl-earfcn=9410"')
print(".", end='')
lte.send_at_cmd('AT+CFUN=1')
print(" OK")
#If correctly configured for carrier network, attach() should succeed.
if not lte.isattached():
print("Attaching to LTE network ", end='')
lte.attach()
while(True):
if lte.isattached():
print(" OK")
break
print('.', end='')
time.sleep(1)
# Once attached, connect() should succeed.
if not lte.isconnected():
print("Connecting on LTE network ", end='')
lte.connect()
while(True):
if lte.isconnected():
print(" OK")
break
print('.', end='')
time.sleep(1)
#Once connect() succeeds, any call requiring Internet access will
#use the active LTE connection.
return lte
#Clean disconnection of the LTE network is required for future
#successful connections without a complete power cycle between.
def endLTE():
print("Disonnecting LTE ... ", end='')
lte.disconnect()
print("OK")
time.sleep(1)
print("Detaching LTE ... ", end='')
lte.dettach()
print("OK")
#Sets the internal real-time clock.
#Needs LTE for Internet access.
def setRTC():
# Ensures LTE session is connected before attempting NTP sync.
lte = getLTE()
print("Updating RTC from {} ".format(NTP_SERVER), end='')
rtc.ntp_sync(NTP_SERVER)
while not rtc.synced():
print('.', end='')
time.sleep(1)
print(' OK')
#Only returns an RTC object that has already been synchronised with an NTP server.
def getRTC():
if not rtc.synced():
setRTC()
return rtc
Program starts here.
try:
print("Initially, the RTC is {}".format("set" if rtc.synced() else "unset"))
rtc = getRTC()
while(True):
print("RTC is {}".format(rtc.now() if rtc.synced() else "unset"))
time.sleep(5)
except Exception:
pass # do nothing on error
finally:
endLTE()
I got this:
[image: 1587666738929-anotaci%C3%B3n-2020-04-23-132854.png]
