HL8548-G modem freezes after KTCPSND

Hi,

I’m trying to follow client mode example of TCPIP exchange from AT document. I get OK response for all commands until KTCPSND command, once I send this one I never get CONNECT from modem and after that modem does not respond to anything (data terminated with KPATTERN, +++, other commands) until I reset it.

Any ideas what is going ion here ?

thanks
Branislav

my modem is HL8548-G, KGSN returns SV:04

here is my log

AT+CSQ
AT+CSQ
+CSQ: 16,99

OK
AT+KCNXCFG=1,“GPRS”,“mnet.bell.ca.ioe”,“login”,“password”,“IPV4”,“0.0.0.0”,“0.0.0.0”,“0.0.0.0”
AT+KCNXCFG=1,“GPRS”,“mnet.bell.ca.ioe”,“login”,“password”,“IPV4”,“0.0.0.0”,“0.0.0.0”,“0.0.0.0”
OK
AT+KTCPCFG=1,0,“www.google.com”,80
AT+KTCPCFG=1,0,“www.google.com”,80
+KTCPCFG: 1
OK
AT+KTCPCNX=1
AT+KTCPCNX=1
OK

+KCNX_IND: 1,4,1

+KCNX_IND: 1,1,0

+KTCP_IND: 1,1
AT+KTCPSND=1,18
AT+KTCPSND=1,18 - this is last response from modem, terminated with single ‘\r’. no other response after this until hardware reset

Seems that the problem was due to very old version of firmware. Once I upgraded to 5.5.14 it started to work.