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From: | nkarakotas |
Subject: | Re: [lwip-users] hayes commands popping up in ppp stream |
Date: | Sat, 15 Nov 2014 00:14:25 +0000 |
Hi, 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); Nick 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 interleaved). 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 chrysn -- This may seem a bit weird, but that's okay, because it is weird. -- perldata(1) about perl variables |
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