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Re: [lwip-users] hayes commands popping up in ppp stream

From: nkarakotas
Subject: Re: [lwip-users] hayes commands popping up in ppp stream
Date: Sat, 15 Nov 2014 00:14:25 +0000


The product is fine,I have been using the SIM900D without any problems in many different countries as well. It may run for a days without dropping the connection. Obviously you have a hardware issue as your not supplying enough voltage or power supply voltage drops when the gsm signal is low and requires 2W.  Also it maybe a setup problem. Are you setting up the SIM900d as transparent mode?

const char *AT_CIPMODE = "AT+CIPMODE=1\r";	
err = sim_send_recv(AT_CIPMODE,13,buf,length,&br);


From: chrysn
Sent: ‎Friday‎, ‎14‎ ‎November‎ ‎2014 ‎6‎:‎39‎ ‎PM
To: address@hidden

hello lwip users,

i'd like to keep track of my gsm device's position while a ppp data
connection is active. unfortunately, that means that the non-ppp
messages (/\r\n+CENG:[0-9,"a-f]+\r\n/ in my case) arrive in the same
stream as ppp messages. (at least, it appears, they are not fully

does the lwip ppp stack provide a mechanism to feed back rejected
strings somewhere else, or do i need to inspect the ppp stack's internal
state from outside, determine whether it is currenlty inside or outside
of a frame, and divert \r\n... sequences from it if no frame is
currently being received?

for reference, i'm working with lwip master branch, and the modem i'm
using is a simcom sim900d. apart from the CENG messages, occasional
"\r\nUNDER-VOLTAGE WARNNING\r\n" (sic) messages appear, and those can't
be switched off.

best regards

This may seem a bit weird, but that's okay, because it is weird.
  -- perldata(1) about perl variables

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