WP7502 not connecting to LTE private APN

IoT Modules WP Series
1

Hello.

I am trying to connect WP7502 chip to LTE network with private APN.

I am using CGDCONT, ATD*99 and pppd (with username and password) commands to setup connection.

pppd hangs up after several seconds, according to network operator specialist the problem is that username and password didn’t reach the operator, just APN name.

Anyone doing the same setup and having a problem or working fine?

Regards.

Apr 11 15:19:34 nto pppd[1021456471-1]: sent [PAP AuthReq id=0x1 user=“xxxxxxx” password=]
Apr 11 15:19:34 nto pppd[1021456471-1]: rcvd [LCP DiscReq id=0x36 magic=0xbfd83647]
Apr 11 15:19:34 nto pppd[1021456471-1]: rcvd [LCP EchoRep id=0x0 magic=0xbfd83647 a1 d2 74 4f]
Apr 11 15:19:34 nto pppd[1021456471-1]: rcvd [PAP AuthAck id=0x1 “”]
Apr 11 15:19:34 nto pppd[1021456471-1]: PAP authentication succeeded
Apr 11 15:19:34 nto pppd[1021456471-1]: sent [CCP ConfReq id=0x1 <deflate 15> <deflate(old#) 15> <bsd v1 15>]
Apr 11 15:19:34 nto pppd[1021456471-1]: sent [IPCP ConfReq id=0x1 <compress VJ 0f 01> <addr 0.0.0.0>]
Apr 11 15:19:34 nto pppd[1021456471-1]: rcvd [LCP ProtRej id=0x37 80 fd 01 01 00 0f 1a 04 78 00 18 04 78 00 15 03 2f]
Apr 11 15:19:34 nto pppd[1021456471-1]: Protocol-Reject for ‘Compression Control Protocol’ (0x80fd) received
Apr 11 15:19:34 nto pppd[1021456471-1]: Modem hangup
Apr 11 15:19:34 nto pppd[1021456471-1]: auth.c: Connection terminated.
Apr 11 15:19:35 nto pppd[1021456471-1]: Exit.

2

Hello.

Is there any legacy/proprietary at command to enter username and password for given APN?

Regards.

3

but here says:
Apr 11 15:19:34 nto pppd[1021456471-1]: PAP authentication succeeded

4

Yes, it says. But it’s not true.

I have changed password in secrets file to a bad one and still it says the same.

If you get IP address you have the password right, if you get sth like this you have the password wrong

Apr 12 06:38:24 nto pppd[500989980-1]: rcvd [IPCP ConfNak id=0x2 <ms-dns1 10.11.12.13> <ms-dns3 10.11.12.14> <ms-wins 10.11.12.13> <ms-wins 10.11.12.14>]

Regars.

5

maybe you can try this command:

6

Have tried, didn’t help.

The only way to connect to LTE is to connect to 3G network (at!selrat) and then start pppd wait for IP address. And then use at!selrat to allow automatic network selection (via AT port, on MODEM port pppd is still running) and it would automatically transfer conection to LTE.

Seems too complicated for me.

Regards.

7

Hello.

I have had a long phone call with telco provider support. They have analyzed logs and the outcome is that during initial signaling module sets the bit that authentication data would be sent later. But that never happened, even in later frames only data about APN were sent, but no info on username and password.

Would this information be driving us to a right direction how to solve the problem?

Regards.

8

Maybe you can capture a wireshark log on your pc and if those data are sent out.

9

Hello.

What log do you have in mind? Probably I could get pppd kdebug log with all characters sent and received. And maybe log of USB communication. But I doubt it would help - as pppd communication with modem is the same regardless of network (2G/3G/4G) chip is connected to. And name and password is successfully delivered to chip in 2G and 3G mode - so it’s almost sure that even in 4G those data is sent to chip. But chip doesn’t send them to network.

Regards.

10

Hello, anyone with some info?

Is there anything like TELIT command AT#PASSW for sierra’s WP7502?

Regards.

11

hello. anyone?

regards.