[lwip-users] ppp over serial works with gsm modem sim900d but not working with sim5216j using same controller harware

[rohanm]

hii ,

i have implemented ppp over serial using gsm modem sim900d. and it works
fine.device gets ip address properly.

but when I replaced GSM modem with sim5216j ,ppp not able to established
connection with sim5216j.
i am using same code and hardware which used for sim900d implementation.

so i have monitored gsm modem response for ppp frames,which i found not as
per protocol.

for ex.

sim 900d response for ipcp frame:  
7E FF 03 80 21 02 03 00 16 03 06 DF E8 B4 7F 81 06 3B 90 7F 75 83 06 CA 38
D7 29 1A 39 7E

sim 5216j response for ipcp frame:
7E 80 21 02 0A 00 16 03 06 6A CF 56 68 81 06 3B 90 7F 75 83 06 CA 38 D7 29
DE 27 7E 

so as per my knowlege,address byte and control byte i.e. 2nd and 3rd byte of
sim 900d response is missing in sim5126j response. 

so any one have idea whats going on.please help me if u have faced this kind
of problem or have solution for it.

regards,
Rohan Mande.



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