Orange Pi IoT 2G Disconnects ppp after connect

mkgokp7s

I try to setup an Internet connection on an OrangePi IoT 2G board with build-in modem. The at-commands are working fine, even connect and start pppd, but one second later it disconnects and therefore ppp daemon dies with exit code=1. According man pacges exit code=1: "Pppd has detached, or otherwise the connection was successfully established and terminated at the peer's request."

The output of wvdial:

1. --> WvDial: Internet dialer version 1.61
   
2. --> Cannot get information for serial port.
   
3. --> Initializing modem.
   
4. --> Sending: ATZ
   
5. ATZ
   
6. OK
   
7. --> Sending: AT+CFUN=1
   
8. AT+CFUN=1
   
9. OK
   
10. --> Sending: AT+EGMR=1,7,xxxxxxxxxxxxxxx
    
11. AT+EGMR=1,7,xxxxxxxxxxxxxxx
    
12. OK
    
13. --> Sending: AT+CGDCONT=1,"IP","internet.t-mobile"
    
14. AT+CGDCONT=1,"IP","internet.t-mobile"
    
15. OK
    
16. --> Modem initialized.
    
17. --> Sending: ATDT*99#
    
18. --> Waiting for carrier.
    
19. ATDT*99#
    
20. CONNECT
    
21. --> Carrier detected.  Starting PPP immediately.
    
22. --> Starting pppd at Fri Mar 27 00:44:41 2020
    
23. --> Pid of pppd: 576
    
24. [  334.253234] PPP generic driver version 2.4.2
    
25. --> Disconnecting at Fri Mar 27 00:44:41 2020
    
26. --> The PPP daemon has died: Fatal pppd error (exit code = 1)

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My /etc/wvdial.conf:

1. [Dialer Defaults]
   
2. Modem Type = Analog Modem
   
3. ISDN = 0
   
4. Init1 = ATZ
   
5. Init2 = AT+CFUN=1
   
6. Modem = /dev/modem0
   
7. Baud = 460800
   
8. Auto Reconnect = on
   
9. #Dial Attemps = 2
   
10. 
    
11. [Dialer congstar]
    
12. Carrier Check = no
    
13. Init3 = AT+EGMR=1,7,xxxxxxxxxxxxxxx
    
14. Init4 = AT+CGDCONT=1,"IP","internet.t-mobile"
    
15. Stupid Mode = 1
    
16. Phone = *99#
    
17. Dialer Command = ATD
    
18. Dial Attemps = 2
    
19. Username = tm
    
20. Password = tm

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To prevent using the IMEI=000000000000000 I set it with the at-command "AT+EGMR=1,7,xxxxxxxxxxxxxxx" to a valid one, but this don't help.
The carrier I'm using is Congstar by T-Mobile Germany.

What could be the problem, any idea?

mkgokp7s

I found a solution - in case anybody else once have the same issue:
1. Use ppp command pon/poff which is much easier to handle and shows better logs
2. Use E-Plus carrier instead of T-Mobile because it simply works with this set of AT-commands. Maybe there are other AT-commands needed by T-Mobile and it works too.

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