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Re: [lwip-users] ppp over serial works with gsm modem sim900d but not wo

From: Sergio R. Caprile
Subject: Re: [lwip-users] ppp over serial works with gsm modem sim900d but not working with sim5216j using same controller harware
Date: Wed, 01 Apr 2015 09:59:51 -0300
User-agent: Mozilla/5.0 (Windows NT 5.1; rv:31.0) Gecko/20100101 Thunderbird/31.5.0

Looking at your frames, the SIM900 outputs a PPP frame with HDLC address and control bytes, while the SIM5216 does not.
I'm by no means a PPP expert, but just looking for PPP in wikipedia shows this:

The Address and Control fields always have the value hex FF (for "all stations") and hex 03 (for "unnumbered information"), and can be omitted whenever PPP LCP Address-and-Control-Field-Compression (ACFC) is negotiated.

You should actually check if that is the case before calling SimCom tech support.

Besides that, those two HDLC-like framed PPP frames containing an IPCP message are equivalent, you are being assigned an IP address and provided primary + secondary DNS addresses

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