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
From: chrysn
Sent: Friday, 14 November 2014 6:39 PM
To: lwip-users@nongnu.org
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
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