PLS8-E : PPP connection issues | Telit Cinterion IoT Developer Community
December 4, 2017 - 1:11pm, 1970 views
We use our own PPP stack with PLS8-E. We saw 2 problems :
1. After modem power up/initialized, after issuing the ATD*99***1#, we start the LCP handshaking with no issues, but the IPCP exchange is very long : 1 to 2 minutes - compared to our other modems - to negociate IP addresses.
2. After modem power up/initialized, after issuing the ATD*99***1#, we start LCP handshaking with no issues, we send the IPCP frames, but the server never answer. Trying once again, some seconds later, and the connection is done correctly.
Note : we noticed, for the problem #2, during our tests : the fact that the +CGREG? tells "+CGREG: 0,1", and the +COPS? tells "+COPS: 0". Anyway, we communicate with the provider server as the LCP handshaking succeeded.
My questions : do you have any ideas why the IPCP is failing or takes a so long time ? Is there any chance for the network attachement (or the modem) to have any influence/impact on our IPCP handshaking ?
You are using your own PPP stack - I think that you could test this with Windows or Linux stacks treating them as a "standard" or reference, nad trace PPP communication for comparison with your stack behavior.
Maybe some settings differe and this could somehow be a cause of your problems.