GSM Functional ??

[diginfo]

I am using SIM5320 which has same AT Commands as the SIM800 only supports 3G.

I am able to communicate with the device using the UART directly, but unable to get any response using the gsm module.

I have enabled PPP && PAP Support as well as enabling the gsm module:

Using UART to get Signal Strength (SIM Card not installed)

>>> import machine as mc
>>> uart = mc.UART(1, tx=22, rx=21, timeout=1000,  buffer_size=1024)
>>> uart.write('AT+CSQ\r\n')
8
>>> uart.any()
21
>>> uart.readln()
'\r\n'
>>> uart.readln()
'+CSQ: 10,99\r\n'
>>> uart.readln()
'\r\n'
>>> uart.readln()
'OK\r\n'
>>> uart.readln()
>>>

Using GSM Module to get Signal Strength (SIM Card not installed)

>>> import gsm
>>> gsm.start(tx=22, rx=21, apn='internet.ht.hr')
True
>>> gsm.status()
(98, 'Not started')
>>> gsm.atcmd('AT+CSQ')
''

Not sure if I have done something wrong, or omitted something, but communication via UART seems OK ?

[loboris]

It is recommended to use gsm module for accessing GSM. See the Wiki. You can also use it with uart access, but the PPPoS will not be available. When using gsm module, it will not enter the idle mode (in which you can use at commands) if the SIM card is not inserted).

import gsm
>>> gsm.start(tx=25, rx=26, apn='internet.ht.hr')
True
>>> gsm.status()
(98, 'Not started')
>>> gsm.status()
(89, 'Idle')
# When not connected (in idle mode), we can issue the at commands
>>> gsm.atcmd('ATI4',printable=True)
'..SIM800 R13.08....OK..'
>>> gsm.atcmd('AT+CSQ',printable=True)
'..+CSQ: 29,0....OK..'
>>> 
# Check and read SMS
>>> gsm.checkSMS(sort=gsm.SORT_NONE, status=gsm.SMS_ALL)
(1,)
>>> gsm.readSMS(1)
(1, 'REC READ', '+385992382166', '18/05/08,09:22:58+08', 1525771378, 0, 'Hi, GSM module on MicroPython')
>>> 
# Go online
>>> gsm.connect()
True
>>> gsm.status()
(1, 'Connected')
>>> 
# While online all network functions works the same way as with Internet connection via WiFi
>>> 
# When Internet connection is no longer needed, disconnect
>>> gsm.disconnect()
>>> gsm.status()
(89, 'Idle')
>>> 

[kindmartin]

now these days nothing as charm/ easy as this gsm module for esp32. its 2021 and current micropython official 1.14 now do not have this beauty :-(