I'm trying to get a PyCom FiPy board working with LTE network connection. I have a hologram sim card. I am using two pieces of code. One is from the PyCom docs the other is from code I found on the PyCom forum for debugging LTE.
import time
from network import LTE
print('main-testy.py starting. This is the code snippet from pycom docs')
#lte = LTE(carrier="verizon")
lte = LTE()
print("trying to attach")
lte.attach(band=13)
while not lte.isattached():
time.sleep(0.5)
print('Attaching...')
print("trying to connect")
lte.connect(cid=3)
while not lte.isconnected():
time.sleep(0.5)
print('Connecting...')
# Now use sockets as usual...
The first few times I ran this code it would attach and then generate a python error on the lte.connect call. The original sample uses a carrier of 'verizon' but a forum post said that was not necessary.
>>> Running main-testy.py
>>>
>>>
main-testy.py starting. This is the code snippet from pycom docs
trying to attach
Attaching...
Attaching...
Attaching...
.. never attaches
Looking through the forums, I found some other users with similar problems. I combined their attempts with some of the avaialable commands from the docs to write this code. It gives some basic info about the simcard and modem. Here is that code.
# Determine carrier notes
from network import LTE
# 1817
lte = LTE()
def send_at_cmd_pretty(cmd):
response = lte.send_at_cmd(cmd).split('\r\n')
for line in response:
print(line)
print("get phy status")
send_at_cmd_pretty('AT!="showphy"') # get the PHY status
print("get System FSM")
send_at_cmd_pretty('AT!="fsm"') # get the System FSM
print("get System COPS. PLMN Selection: +COPS")
print("!!!!!!!!!1 always generates error !!!!!!!!!!!!")
send_at_cmd_pretty('AT+COPS=?') # get the System FSM
print("get conformance test modes. List of carriers? ")
send_at_cmd_pretty("AT+SQNCTM=?") # get list of carriers for
# results are
# "3gpp-conformance", "att", "docomo", "kt", "lgu", "softbank", "standard", "telstra", "verizon")
results = lte.imei()
print("lte.imei results \n{}" . format(results))
results = lte.iccid()
print("lte.iccid results \n{}" . format(results))
All of this code runs but one of the commands (+COPS) gives an error. I did check the AT command reference and the syntax is +COPYS=? appears correct. Perhaps that particular command can only be issued once its attached.
>> Running lte-basic-operations.py
>>>
>>>
get phy status
DL SYNCHRO STATISTICS
=====================
Synchro state : OFF
PPU SIB1 ACQ watchdog : 0
Frequency Hypothesis RF (Hz) : 0
RSRP (dBm) : 0.00
RSRQ (dB) : 0.00
Channel estimation state (Cell-spec.) : LOW CINR
Channel estimation state (UE-spec.) : LOW CINR
Channel estimation state (MBSFN) : LOW CINR
Channel estimation CINR : 0.00
Channel length : SHORT
AGC
AGC RX gain (dB) : 0.00
RX PSD BO (dBFs) : 0.00
RX PSD (dBm) : 0.00
Noise level RS (dBm) : 0.00
Digital gain (dB) : 0.00
CINR RS (dB) : 0.00
NARROWBANDS
Last DL NB : 0
Last UL NB : 0
AFC
Frequency offset RF (Hz) : 0
Frequency offset BB (Hz) : 0
PBCH
MIB received quantity : 0
MIB timeout quantity : 0
OK
get System FSM
SYSTEM FSM
==========
+--------------------------+--------------------+
| FSM | STATE |
+--------------------------+--------------------+
| RRC TOP FSM |STOPPED |
| RRC SEARCH FSM |NULL |
| RRC ACTIVE FSM |NULL |
| PMM PLMN FSM |NULL |
| EMM MAIN FSM |NULL |
| EMM AUTH FSM |NULL |
| EMM CONN FSM |NULL |
| EMM TAU FSM |NULL |
| EMM TEST FSM |NULL |
| ESM BEARER FSM |BEARER_NULL |
| SMS MT FSM |IDLE |
| SMS MO FSM |IDLE |
| HP MAIN FSM |IDLE |
| HP USIM FSM |NULL |
| HP SMS MO FSM |IDLE |
| HP SMS MT FSM |IDLE |
| HP CAT FSM |NULL |
+--------------------------+--------------------+
OK
get System COPS. PLMN Selection: +COPS
!!!!!!!!!1 always generates error !!!!!!!!!!!!
ERROR
get conformance test modes. List of carriers?
+SQNCTM: ("3gpp-conformance", "att", "docomo", "kt", "lgu", "softbank", "standard", "telstra", "verizon")
OK
lte.imei results
354346095554902
lte.iccid results
8944500208186565235
>
I did manage to get LTE working with a hologram card. However, it is not 100% reliable. Sometimes it will stall or get hung up. Any opinions is appreciated.
import time
from network import LTE
import utime
import machine
import _thread
print('main-testy.py starting. This is the code snippet from pycom docs')
def send_at_cmd_pretty(cmd):
response = lte.send_at_cmd(cmd).split('\r\n')
for line in response:
print(line)
def do_ntp(a_server):
# Syncing time
RTCI = machine.RTC()
print('Syncing time with %s' % a_server, end='')
RTCI.ntp_sync(a_server)
while not RTCI.synced():
print('.', end='')
utime.sleep(1)
print('')
def get_time_as_string():
year, month, mday, hour, minute, second, weekday, yearday = utime.localtime()
# form an iso time string
# eg. 1985-12-04T23:20:50
a_string = '{}-{:02d}-{:02d}T{:02d}:{:02d}:{:02d}' . format(year, month, mday, hour, minute, second)
return a_string
###############################################
lte = LTE()
lte.reset()
lte.init()
print("trying to attach")
#lte.attach(band=13)
lte.attach()
while not lte.isattached():
time.sleep(0.5)
#print('Attaching...')
print('Attaching...', end='')
send_at_cmd_pretty('AT+CEREG?') # get the System FSM
time.sleep(5)
print("trying to connect")
#lte.connect(cid=3)
lte.connect()
while not lte.isconnected():
time.sleep(0.5)
print('Connecting...')
time.sleep(5)
# Now use sockets as usual...
print('**** connected ***********************')
do_ntp('time.google.com')
#do_ntp('pool.ntp.org')
time.sleep(5)
print(get_time_as_string())