How would I create a PPPoS connection over PPP using an ESP32 and a BG95-M3 modem? #11501

sethstenzel · 2023-05-15T06:47:28Z

sethstenzel
May 15, 2023

Greetings,

I would like to use a BG95-M3 modem for a small IOT project. The modem has a good connection, I can use IP base functions like opening up socket connections with the modem QOPEN commands and using built-in MQTT functions, sending SMS etc.

I'm hoping to use the modem with some standard MicroPython libraries, but I am struggling to figure out how to use PPP and a serial connection to get a PPPoS connection and get online. Right now, I seem to get a PPP open channel on my BG95-M3, but nothing seems to seem after. I would assume LWIP would take place someplace after the raw connection. However, the device never seems to get an associate IP or get connected and I"m not sure how to troubleshoot the issue even.

Any assistance would be greatly appreciated.

Here is some super basic code below and the current output.

import network
import machine
from time import sleep

UART = machine.UART(
    2,
    baudrate=460929,
    bits=8,
    parity=None,
    stop=1,
    tx=32,
    rx=34,
    rts=25,
    cts=12,
    txbuf=2048,
    rxbuf=2048,
    timeout=2000,
)


def uwrite(command: str):
    command += "\r\n"
    UART.write(command.encode("utf8"))
    print(f">>: {command}")
    sleep(1)


uwrite("ATE0")
print(UART.read().decode("utf8"))
uwrite('AT+CGDCONT=1,"IP","data.apn.name",,0,0')  # set apn
print(UART.read().decode("utf8"))
uwrite("AT+QIACT?")  # query valid pdp
if "+QIACT: " not in UART.read().decode("utf8"):
    uwrite("AT+QIACT=1")  # create pdp
    print(UART.read().decode("utf8"))

uwrite("ATD*99#")  # activate ppp mode
print(UART.read().decode("utf8"))

pppos = network.PPP(UART)
pppos.active(True)
pppos.connect(authmode=pppos.AUTH_CHAP, username="", password="")


attempts = 30
while not pppos.isconnected() and attempts > 0:
    attempts -= 1
    status = pppos.status()
    connection_state = pppos.isconnected()
    print(f"[PPP] Connection state: {connection_state}. Status {status}")
    sleep(3)
    if pppos.isconnected():
        print(
            "Connected",
            connection_state,
        )
        print(pppos.ifconfig())
        ever_connected = True
    sleep(3)
sleep(2)
uwrite("+++")  # leave transparent ppp mode
sleep(2)

OUTPUT

>>: ATE0
OK

>>: AT+CGDCONT=1,"IP","data.apn.name",,0,0
OK

>>: AT+QIACT?
>>: ATD*99#
CONNECT 150000000

[PPP] Connection state: False. Status None

|
|  skipping ahead to the end of the retries
V

[PPP] Connection state: False. Status None
>>: +++

bidrohini · 2023-05-15T09:28:57Z

bidrohini
May 15, 2023

You can verify AT Command Responses:
After sending AT commands to the modem, make sure to wait for and read the modem's response before proceeding. Update your code to wait for and print the response after sending each command:

uwrite("ATE0")
print(UART.read().decode("utf8"))

uwrite('AT+CGDCONT=1,"IP","data.apn.name",,0,0')
print(UART.read().decode("utf8"))

uwrite("AT+QIACT?")
print(UART.read().decode("utf8"))

This will help ensure that you're receiving the correct responses from the modem.

1 reply

sethstenzel May 15, 2023
Author

The timeout for the read is 2 seconds right now which is way more than needed, I'm getting the correct responses back, and the modem is going into transparent mode; my issue is I have no idea what data is being exchanged between the network.PPP function and the modem once it is in raw mode. I'm already getting the expected responses from the AT commands up until that point.

sethstenzel · 2023-05-17T17:08:16Z

sethstenzel
May 17, 2023
Author

@peterhinch, @robert-hh, I hate to tag you like this, but you two have so much experience. Would you advise briefly on how I might troubleshoot an issue like this? Could you give me a few pointers, and I can go off and do the leg work? I do know that other folks within my organization on another team have PPPoS working with the ESP32, and the same BG95-M3 modem, but they don't have the capacity to troubleshoot, do not know python/microphone, and were unsure how to advise in troubleshooting when I had them take a look.

3 replies

peterhinch May 22, 2023
Collaborator

I have no experience of PPP modems, so can only offer very general advice. The best way to troubleshoot asynchronous serial communications is to use a logic analyser. My Saleae can decode the bitstreams showing the characters being transferred in both directions. Timing of the bitstreams can be measured exactly.

sethstenzel May 22, 2023
Author

Thanks so much for the advice Peter. I guess I have an excuse to buy a new toy and then learn and use it :)

peterhinch May 22, 2023
Collaborator

Saleae LA's aren't cheap but their software is superb. I started out with a Chinese clone but upgraded to a real one when I needed to capture pre-trigger data. This is invaluable: being able to see what happened before the bug you're chasing has occurred.

ThinkTransit · 2023-05-24T13:29:59Z

ThinkTransit
May 24, 2023
Sponsor

I haven't tried this myself however I know the esp32 has a config option for PPP debugging, LWIP_PPP_DEBUG_ON

1 reply

sethstenzel May 24, 2023
Author

So I tried this, and I did get some data, but what I got back made no sense to me at all. There was data and some references to sending and receiving, but I couldn't see a way to see what was in the data, just that there was some communication going on, but not really what kind. I can try and post that here I think I still have it somewhere.

sethstenzel · 2023-06-17T01:59:45Z

sethstenzel
Jun 17, 2023
Author

Here is some of the output after turning on LWIP_PPP_DEBUG_ON

This is with .AUTH_CHAP

>>> import ppp
netif: netmask of interface  set to 255.0.0.0
netif: GW address of interface  set to 127.0.0.1
netif_set_ipaddr: netif address being changed
netif: added interface lo IP addr 127.0.0.1 netmask 255.0.0.0 gw 127.0.0.1
netif: netmask of interface  set to 255.255.255.255
netif: added interface pp IP addr 0.0.0.0 netmask 255.255.255.255 gw 0.0.0.0
ppp phase changed[1]: phase=0
>>: ATE0


OK

>>: AT+CGDCONT=1,"IP","data.apn.name",,0,0


OK

>>: AT+QIACT?

None
>>: AT&C0


OK

>>: ATD*99#


CONNECT 150000000

netif: setting default interface pp
ppp_connect[1]: holdoff=0
ppp phase changed[1]: phase=3
pppos_connect: unit 1: connecting
ppp_start[1]
ppp phase changed[1]: phase=6
pppos_send_config[1]: out_accm=FF FF FF FF
ppp_send_config[1]
pppos_recv_config[1]: in_accm=FF FF FF FF
ppp_recv_config[1]
ppp: auth protocols: PAP=0 CHAP=1 CHAP_MD5=1
sent [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0x919d90a4> <pcomp> <accomp>]
pppos_write[1]: len=24
ppp_start[1]: finished
pppos_input[1]: got 256 bytes
rcvd [LCP ConfReq id=0x96 <asyncmap 0x0> <auth pap> <magic 0x6656cda> <pcomp> <accomp>]
sent [LCP ConfNak id=0x96 <auth chap MD5>]
pppos_write[1]: len=13
rcvd [LCP ConfAck id=0x1 <asyncmap 0x0> <magic 0x919d90a4> <pcomp> <accomp>]
rcvd [LCP ConfReq id=0x97 <asyncmap 0x0> <auth pap> <magic 0x6656cda> <pcomp> <accomp>]
sent [LCP ConfNak id=0x97 <auth chap MD5>]
pppos_write[1]: len=13
rcvd [LCP ConfReq id=0x98 <asyncmap 0x0> <auth pap> <magic 0x6656cda> <pcomp> <accomp>]
sent [LCP ConfNak id=0x98 <auth chap MD5>]
pppos_write[1]: len=13
rcvd [LCP ConfReq id=0x99 <asyncmap 0x0> <auth pap> <magic 0x6656cda> <pcomp> <accomp>]
sent [LCP ConfNak id=0x99 <auth chap MD5>]
pppos_write[1]: len=13
sent [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0x919d90a4> <pcomp> <accomp>]
pppos_write[1]: len=24
pppos_input[1]: got 256 bytes
rcvd [LCP ConfReq id=0x9a <asyncmap 0x0> <auth pap> <magic 0x6656cda> <pcomp> <accomp>]
sent [LCP ConfNak id=0x9a <auth chap MD5>]
pppos_write[1]: len=13
rcvd [LCP ConfReq id=0x9b <asyncmap 0x0> <auth pap> <magic 0x6656cda> <pcomp> <accomp>]
sent [LCP ConfRej id=0x9b <auth pap>]
pppos_write[1]: len=12
rcvd [LCP ConfReq id=0x9c <asyncmap 0x0> <auth pap> <magic 0x6656cda> <pcomp> <accomp>]
sent [LCP ConfRej id=0x9c <auth pap>]
pppos_write[1]: len=12
rcvd [LCP ConfAck id=0x1 <asyncmap 0x0> <magic 0x919d90a4> <pcomp> <accomp>]
rcvd [LCP ConfReq id=0x9d <asyncmap 0x0> <auth pap> <magic 0x6656cda> <pcomp> <accomp>]
sent [LCP ConfRej id=0x9d <auth pap>]
pppos_write[1]: len=12
sent [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0x919d90a4> <pcomp> <accomp>]
pppos_write[1]: len=24
pppos_input[1]: got 256 bytes
rcvd [LCP ConfReq id=0x9e <asyncmap 0x0> <auth pap> <magic 0x6656cda> <pcomp> <accomp>]
sent [LCP ConfRej id=0x9e <auth pap>]
pppos_write[1]: len=12
rcvd [LCP ConfReq id=0x9f <asyncmap 0x0> <auth pap> <magic 0x6656cda> <pcomp> <accomp>]
sent [LCP ConfRej id=0x9f <auth pap>]
pppos_write[1]: len=12
rcvd [LCP ConfReq id=0xa0 <asyncmap 0x0> <auth pap> <magic 0x6656cda> <pcomp> <accomp>]
sent [LCP ConfRej id=0xa0 <auth pap>]
pppos_write[1]: len=12
rcvd [LCP ConfReq id=0xa1 <asyncmap 0x0> <auth pap> <magic 0x6656cda> <pcomp> <accomp>]
sent [LCP ConfRej id=0xa1 <auth pap>]
pppos_write[1]: len=12
rcvd [LCP ConfReq id=0xa2 <asyncmap 0x0> <auth pap> <magic 0x6656cda> <pcomp> <accomp>]
sent [LCP ConfRej id=0xa2 <auth pap>]
pppos_write[1]: len=12
pppos_input[1]: got 256 bytes
rcvd [LCP ConfAck id=0x1 <asyncmap 0x0> <magic 0x919d90a4> <pcomp> <accomp>]
rcvd [LCP ConfReq id=0xa3 <asyncmap 0x0> <magic 0x6656cda> <pcomp> <accomp>]
sent [LCP ConfAck id=0xa3 <asyncmap 0x0> <magic 0x6656cda> <pcomp> <accomp>]
pppos_write[1]: len=24
netif_set_mtu[1]: mtu=1500
pppos_send_config[1]: out_accm=0 0 0 0
ppp_send_config[1]
pppos_recv_config[1]: in_accm=0 0 0 0
ppp_recv_config[1]
ppp phase changed[1]: phase=7
ppp phase changed[1]: phase=9
sent [IPCP ConfReq id=0x1 <compress VJ 0f 01> <addr 0.0.0.0> <ms-dns1 0.0.0.0> <ms-dns2 0.0.0.0>]
pppos_write[1]: len=32
sent [IPV6CP ConfReq id=0x1 <addr fe80::089f:55f5:c0dc:831a>]
pppos_write[1]: len=18
rcvd [LCP ConfReq id=0xa4 <asyncmap 0x0> <magic 0x6656cda> <pcomp> <accomp>]
ppp phase changed[1]: phase=6
pppos_send_config[1]: out_accm=FF FF FF FF
ppp_send_config[1]
pppos_recv_config[1]: in_accm=0 0 0 0
ppp_recv_config[1]
ppp: auth protocols: PAP=0 CHAP=1 CHAP_MD5=1
sent [LCP ConfReq id=0x2 <asyncmap 0x0> <magic 0x5686ac1e> <pcomp> <accomp>]
pppos_write[1]: len=24
sent [LCP ConfAck id=0xa4 <asyncmap 0x0> <magic 0x6656cda> <pcomp> <accomp>]
pppos_write[1]: len=24
rcvd [LCP ConfReq id=0xa5 <asyncmap 0x0> <magic 0x6656cda> <pcomp> <accomp>]
sent [LCP ConfAck id=0xa5 <asyncmap 0x0> <magic 0x6656cda> <pcomp> <accomp>]
pppos_write[1]: len=24
rcvd [LCP ConfReq id=0xa6 <asyncmap 0x0> <magic 0x6656cda> <pcomp> <accomp>]
sent [LCP ConfAck id=0xa6 <asyncmap 0x0> <magic 0x6656cda> <pcomp> <accomp>]
pppos_write[1]: len=24
pppos_input[1]: got 256 bytes
rcvd [LCP ConfReq id=0xa7 <asyncmap 0x0> <magic 0x6656cda> <pcomp> <accomp>]
sent [LCP ConfAck id=0xa7 <asyncmap 0x0> <magic 0x6656cda> <pcomp> <accomp>]
pppos_write[1]: len=24
rcvd [LCP ConfAck id=0x2 <asyncmap 0x0> <magic 0x5686ac1e> <pcomp> <accomp>]
netif_set_mtu[1]: mtu=1500
pppos_send_config[1]: out_accm=0 0 0 0
ppp_send_config[1]
pppos_recv_config[1]: in_accm=0 0 0 0
ppp_recv_config[1]
ppp phase changed[1]: phase=7
ppp phase changed[1]: phase=9
sent [IPCP ConfReq id=0x2 <compress VJ 0f 01> <addr 0.0.0.0> <ms-dns1 0.0.0.0> <ms-dns2 0.0.0.0>]
pppos_write[1]: len=32
sent [IPV6CP ConfReq id=0x2 <addr fe80::4d5e:044b:b56c:ae71>]
pppos_write[1]: len=18
rcvd [LCP ConfReq id=0xa8 <asyncmap 0x0> <magic 0x6656cda> <pcomp> <accomp>]
ppp phase changed[1]: phase=6
pppos_send_config[1]: out_accm=FF FF FF FF
ppp_send_config[1]
pppos_recv_config[1]: in_accm=0 0 0 0
ppp_recv_config[1]
ppp: auth protocols: PAP=0 CHAP=1 CHAP_MD5=1
sent [LCP ConfReq id=0x3 <asyncmap 0x0> <magic 0xc0e9b831> <pcomp> <accomp>]
pppos_write[1]: len=24
sent [LCP ConfAck id=0xa8 <asyncmap 0x0> <magic 0x6656cda> <pcomp> <accomp>]
pppos_write[1]: len=24
rcvd [LCP ConfReq id=0xa9 <asyncmap 0x0> <magic 0x6656cda> <pcomp> <accomp>]
sent [LCP ConfAck id=0xa9 <asyncmap 0x0> <magic 0x6656cda> <pcomp> <accomp>]
pppos_write[1]: len=24
rcvd [LCP ConfReq id=0xaa <asyncmap 0x0> <magic 0x6656cda> <pcomp> <accomp>]
sent [LCP ConfAck id=0xaa <asyncmap 0x0> <magic 0x6656cda> <pcomp> <accomp>]
pppos_write[1]: len=24
rcvd [LCP ConfReq id=0xab <asyncmap 0x0> <magic 0x6656cda> <pcomp> <accomp>]
sent [LCP ConfAck id=0xab <asyncmap 0x0> <magic 0x6656cda> <pcomp> <accomp>]
pppos_write[1]: len=24
pppos_input[1]: got 256 bytes
rcvd [LCP ConfReq id=0xac <asyncmap 0x0> <magic 0x6656cda> <pcomp> <accomp>]
sent [LCP ConfAck id=0xac <asyncmap 0x0> <magic 0x6656cda> <pcomp> <accomp>]
pppos_write[1]: len=24
rcvd [LCP ConfAck id=0x3 <asyncmap 0x0> <magic 0xc0e9b831> <pcomp> <accomp>]
netif_set_mtu[1]: mtu=1500
pppos_send_config[1]: out_accm=0 0 0 0
ppp_send_config[1]
pppos_recv_config[1]: in_accm=0 0 0 0
ppp_recv_config[1]
ppp phase changed[1]: phase=7
ppp phase changed[1]: phase=9
sent [IPCP ConfReq id=0x3 <compress VJ 0f 01> <addr 0.0.0.0> <ms-dns1 0.0.0.0> <ms-dns2 0.0.0.0>]
pppos_write[1]: len=32
sent [IPV6CP ConfReq id=0x3 <addr fe80::55d4:3fa4:aaa6:a270>]
pppos_write[1]: len=18
rcvd [LCP ConfReq id=0xad <asyncmap 0x0> <magic 0x6656cda> <pcomp> <accomp>]
ppp phase changed[1]: phase=6
pppos_send_config[1]: out_accm=FF FF FF FF
ppp_send_config[1]
pppos_recv_config[1]: in_accm=0 0 0 0
ppp_recv_config[1]
ppp: auth protocols: PAP=0 CHAP=1 CHAP_MD5=1
sent [LCP ConfReq id=0x4 <asyncmap 0x0> <magic 0x33cefdc2> <pcomp> <accomp>]
pppos_write[1]: len=24
sent [LCP ConfAck id=0xad <asyncmap 0x0> <magic 0x6656cda> <pcomp> <accomp>]
pppos_write[1]: len=24
rcvd [LCP ConfReq id=0xae <asyncmap 0x0> <magic 0x6656cda> <pcomp> <accomp>]
sent [LCP ConfAck id=0xae <asyncmap 0x0> <magic 0x6656cda> <pcomp> <accomp>]
pppos_write[1]: len=24
rcvd [LCP ConfReq id=0xaf <asyncmap 0x0> <magic 0x6656cda> <pcomp> <accomp>]
sent [LCP ConfAck id=0xaf <asyncmap 0x0> <magic 0x6656cda> <pcomp> <accomp>]
pppos_write[1]: len=24
rcvd [LCP ConfReq id=0xb0 <asyncmap 0x0> <magic 0x6656cda> <pcomp> <accomp>]
sent [LCP ConfAck id=0xb0 <asyncmap 0x0> <magic 0x6656cda> <pcomp> <accomp>]
pppos_write[1]: len=24
pppos_input[1]: got 256 bytes
rcvd [LCP ConfReq id=0xb1 <asyncmap 0x0> <magic 0x6656cda> <pcomp> <accomp>]
sent [LCP ConfAck id=0xb1 <asyncmap 0x0> <magic 0x6656cda> <pcomp> <accomp>]
pppos_write[1]: len=24
rcvd [LCP ConfAck id=0x4 <asyncmap 0x0> <magic 0x33cefdc2> <pcomp> <accomp>]
netif_set_mtu[1]: mtu=1500
pppos_send_config[1]: out_accm=0 0 0 0
ppp_send_config[1]
pppos_recv_config[1]: in_accm=0 0 0 0
ppp_recv_config[1]
ppp phase changed[1]: phase=7
ppp phase changed[1]: phase=9
sent [IPCP ConfReq id=0x4 <compress VJ 0f 01> <addr 0.0.0.0> <ms-dns1 0.0.0.0> <ms-dns2 0.0.0.0>]
pppos_write[1]: len=32
sent [IPV6CP ConfReq id=0x4 <addr fe80::407f:94fa:4687:bd23>]
pppos_write[1]: len=18
rcvd [LCP ConfReq id=0xb2 <asyncmap 0x0> <magic 0x6656cda> <pcomp> <accomp>]
ppp phase changed[1]: phase=6
pppos_send_config[1]: out_accm=FF FF FF FF
ppp_send_config[1]
pppos_recv_config[1]: in_accm=0 0 0 0
ppp_recv_config[1]
ppp: auth protocols: PAP=0 CHAP=1 CHAP_MD5=1
sent [LCP ConfReq id=0x5 <asyncmap 0x0> <magic 0x8793660d> <pcomp> <accomp>]
pppos_write[1]: len=24
sent [LCP ConfAck id=0xb2 <asyncmap 0x0> <magic 0x6656cda> <pcomp> <accomp>]
pppos_write[1]: len=24
rcvd [LCP ConfReq id=0xb3 <asyncmap 0x0> <magic 0x6656cda> <pcomp> <accomp>]
sent [LCP ConfAck id=0xb3 <asyncmap 0x0> <magic 0x6656cda> <pcomp> <accomp>]
pppos_write[1]: len=24
rcvd [LCP ConfReq id=0xb4 <asyncmap 0x0> <magic 0x6656cda> <pcomp> <accomp>]
sent [LCP ConfAck id=0xb4 <asyncmap 0x0> <magic 0x6656cda> <pcomp> <accomp>]
pppos_write[1]: len=24
pppos_input[1]: got 115 bytes
rcvd [LCP ConfReq id=0xb5 <asyncmap 0x0> <magic 0x6656cda> <pcomp> <accomp>]
sent [LCP ConfAck id=0xb5 <asyncmap 0x0> <magic 0x6656cda> <pcomp> <accomp>]
pppos_write[1]: len=24
rcvd [LCP ConfAck id=0x5 <asyncmap 0x0> <magic 0x8793660d> <pcomp> <accomp>]
netif_set_mtu[1]: mtu=1500
pppos_send_config[1]: out_accm=0 0 0 0
ppp_send_config[1]
pppos_recv_config[1]: in_accm=0 0 0 0
ppp_recv_config[1]
ppp phase changed[1]: phase=7
ppp phase changed[1]: phase=9
sent [IPCP ConfReq id=0x5 <compress VJ 0f 01> <addr 0.0.0.0> <ms-dns1 0.0.0.0> <ms-dns2 0.0.0.0>]
pppos_write[1]: len=32
sent [IPV6CP ConfReq id=0x5 <addr fe80::555b:8541:d2c6:8cfd>]
pppos_write[1]: len=18
rcvd [LCP ConfReq id=0xb6 <asyncmap 0x0> <magic 0x6656cda> <pcomp> <accomp>]
ppp phase changed[1]: phase=6
pppos_send_config[1]: out_accm=FF FF FF FF
ppp_send_config[1]
pppos_recv_config[1]: in_accm=0 0 0 0
ppp_recv_config[1]
ppp: auth protocols: PAP=0 CHAP=1 CHAP_MD5=1
sent [LCP ConfReq id=0x6 <asyncmap 0x0> <magic 0x183b5629> <pcomp> <accomp>]
pppos_write[1]: len=24
sent [LCP ConfAck id=0xb6 <asyncmap 0x0> <magic 0x6656cda> <pcomp> <accomp>]
pppos_write[1]: len=24
sent [LCP ConfReq id=0x6 <asyncmap 0x0> <magic 0x183b5629> <pcomp> <accomp>]
pppos_write[1]: len=24
sent [LCP ConfReq id=0x6 <asyncmap 0x0> <magic 0x183b5629> <pcomp> <accomp>]
pppos_write[1]: len=24
sent [LCP ConfReq id=0x6 <asyncmap 0x0> <magic 0x183b5629> <pcomp> <accomp>]
pppos_write[1]: len=24
sent [LCP ConfReq id=0x6 <asyncmap 0x0> <magic 0x183b5629> <pcomp> <accomp>]
pppos_write[1]: len=24
sent [LCP ConfReq id=0x6 <asyncmap 0x0> <magic 0x183b5629> <pcomp> <accomp>]
pppos_write[1]: len=24
sent [LCP ConfReq id=0x6 <asyncmap 0x0> <magic 0x183b5629> <pcomp> <accomp>]
pppos_write[1]: len=24
sent [LCP ConfReq id=0x6 <asyncmap 0x0> <magic 0x183b5629> <pcomp> <accomp>]
pppos_write[1]: len=24
sent [LCP ConfReq id=0x6 <asyncmap 0x0> <magic 0x183b5629> <pcomp> <accomp>]
pppos_write[1]: len=24
sent [LCP ConfReq id=0x6 <asyncmap 0x0> <magic 0x183b5629> <pcomp> <accomp>]
pppos_write[1]: len=24
LCP: timeout sending Config-Requests
ppp phase changed[1]: phase=12
Connection terminated.
ppp_link_terminated[1]
ppp_link_end[1]
ppp phase changed[1]: phase=0
ppp_link_terminated[1]: finished.

0 replies

Tangerino · 2023-06-17T10:30:03Z

Tangerino
Jun 17, 2023

I've created my own MP board with ESP32 and 4G modem.
I've been looking around, for while an working sample code and never get it back from the community any help.
The modem works fine when using its internal tcp stack.
But ideally PPP is the best option to make the socket api transparent, including the MQTT client.
When I start PPP, after issuing the right AT commands I get nothing back.
This is quite old

https://forum.micropython.org/viewtopic.php?f=2&t=12472&p=67705&hilit=PPP#p67705

Any help would be wonderful.

2 replies

ThinkTransit Jun 17, 2023
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What is your micropython code?

zzfjean Jan 23, 2024

@Tangerino this code works for me. Took me a while to figure out how to put my GSM module (SARA R422) into PPP mode.

uart2 = UART(2, baudrate=921600, tx = 14, rx=21,txbuf=4096, rxbuf=4096, timeout=200) ### AUX PORT FOR PPP
uart2.write('AT\r\n')
if "OK" in (uart2.read()):
print("Aux uart connected") #activate context
uart2.write("ATD*99#\r\n")

pppos = network.PPP(uart2)
pppos.active(True)
pppos.connect()

MicroPython

How would I create a PPPoS connection over PPP using an ESP32 and a BG95-M3 modem? #11501

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sethstenzel May 15, 2023

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sethstenzel Jun 17, 2023 Author

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Tangerino Jun 17, 2023

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ThinkTransit Jun 17, 2023 Sponsor

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zzfjean Jan 23, 2024

sethstenzel
May 15, 2023

Replies: 5 comments 7 replies

bidrohini
May 15, 2023

sethstenzel May 15, 2023
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sethstenzel
May 17, 2023
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peterhinch May 22, 2023
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sethstenzel May 22, 2023
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peterhinch May 22, 2023
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May 24, 2023
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sethstenzel May 24, 2023
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sethstenzel
Jun 17, 2023
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Tangerino
Jun 17, 2023

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