Hello,
We are facing issues related to HTTP DNS ERROR (+CME ERROR 714) with using BG77 module. It appears only few hours after boot.
Most of the time we are asking GNSS NMEA frames, but every minute we power off the GPS, do a HTTPS POST REQUEST to send GNSS data, then we power-on the GPS again and go further with NMEA messages.
This works fine, however few hours after boot every QHTTPPOST command gets a “+CME ERROR 714” (corresponding to a HTTP DNS error). Nothing is received by our server, and we never get back to the normal behaviour with HTTP 200 return code. It’s only resolved by a battery power-off/power-on of our device.
AT commands Init sequence:
RDY
APP RDY
ATE1
OK
AT+QCCID
+QCCID: 89320420000002505905
OK
AT+QGPSXTRA?
+QGPSXTRA: 1
OK
AT+QCFG=“iotopmode”,0
OK
AT+QCFG=“nwscanseq”,02
OK
AT+CREG=1
OK
AT+QICSGP=1,1,“bicsapn”,"","",0
OK
AT+QHTTPCFG=“sslctxid”,1
OK
AT+QSSLCFG=“sslversion”,1,3
OK
AT+QSSLCFG=“ciphersuite”,1,0xFFFF
OK
AT+QSSLCFG=“seclevel”,1,0
OK
AT+QHTTPCFG=“requestheader”,1
OK
AT+QHTTPURL=21,20
CONNECT
OK
AT+QGPSCFG=“priority”,1
OK
AT+COPS?
+COPS: 1
OK
AT+COPS=4,0,“Orange F”,8
OK
AT+CEDRXS=2,5,“0100”
OK
AT+QGPSCFG=“nmeasrc”,1
OK
AT+QGPS=1
OK
AT+QGPSCFG=“priority”,0
OK
GNSS usual behaviour every 3 seconds:
AT+QGPSGNMEA=“GGA”
+QGPSGNMEA: $GPGGA,182259.00,— XXX ----1,06,0.9,57.1,M,47.6,M,56
OK
AT+QGPSGNMEA=“RMC”
+QGPSGNMEA: $GPRMC,182259.00,— XXX —,E,0.0,220721,2.0,W,A,V76
OK
Every minute for LTEM HTTPS POST request:
AT+QGPSEND
OK
AT+CREG?
+CREG: 1,5
OK
AT+QCSQ
+QCSQ: “eMTC”,-71,-97,110,-13
OK
AT+QIACT=1
OK
AT+QIACT?
+QIACT: 1,1,1,“100.65.75.46”
OK
AT+QIDNSCFG=1,“8.8.8.8”,“8.8.4.4”
OK
AT+QHTTPPOST=379,20,20
CONNECT
OK
+QHTTPPOST: 0,200,39
AT+QHTTPREAD=80
CONNECT
{“status”:“ok”,“tms”:1626978302.47648}
OK
+QHTTPREAD: 0
AT+QIDEACT=1
OK
AT+QGPSCFG=“nmeasrc”,1
OK
AT+QGPS=1
OK
When the issue appears during sending request sequence:
AT+QGPSEND
OK
AT+CREG?
+CREG: 1,5
OK
AT+QCSQ
+QCSQ: “eMTC”,-72,-96,127,-14
OK
AT+QIACT=1
OK
AT+QIACT?
+QIACT: 1,1,1,“100.65.75.46”
OK
AT+QIDNSCFG=1,“8.8.8.8”,“8.8.4.4”
OK
AT+QHTTPPOST=379,20,20
+CME ERROR: 714
AT+QIDEACT=1
OK
AT+QGPSCFG=“nmeasrc”,1
OK
AT+QGPS=1
OK
BG77 firmware version : BG77LAR02A04_01.002.01.002
Thanks for your help
