# GNSS stop to work **URL:** \ **Category:** XS Series (GNSS)\ **Created:** [October 31, 2019, 4:12pm UTC](https://forum.sierrawireless.com/t/gnss-stop-to-work/18140 "2019-10-31T16:12:23Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![anna\_lel](https://avatars.discourse-cdn.com/v4/letter/a/c37758/32.png) [@anna\_lel](https://forum.sierrawireless.com/u/anna_lel)\ **Post date:** [October 31, 2019, 4:12pm UTC](https://forum.sierrawireless.com/t/gnss-stop-to-work/18140/1 "2019-10-31T16:12:23Z")
Hi, I have a problem with the GNSS module - can’t obtain a lock GNSSSEV:3,2 or GNSSSEV:3,3. ## My settings: ATI9 HL7800-M.2.5.6 BHL78xx.2.5.6.1.RK\_02\_01\_01\_00\_41.20190412 2019/04/12 16:08:23 IMEI-SV: 3594160905626304 Legato RTOS: 18.09.2.ALT1250.rc5 2019/04/04 14:02:47 atSwi: 13.01 UBOOT: 01.03 Apps: RKAPP\_02\_01\_01\_00\_37\_\_76cc94b4672ac9bde0f08de3724a5c20b28bc2ba MAC: ALT1250\_02\_01\_01\_00\_38\_FW PHY: 12.50.209178 PMP: 209236 SBUB: 0 SBFW: 0 RPuK: FPuK: RBUB: 0 RBFW: 0 * * * I need to open TCP connection for sending/receiving data and periodically check if GPS is received a position event. The problems: 1. GNSSSTART=0 +GNSSEV: 1,1 it says GNSS is started successfully, but if I send AT+GNSSNMEA=04, I receive CONNECT status, but no “$GP” messages during 10 seconds. Command ends by sending “+++”. If I retry again with restarting of GNSS - it helps and I start to receive “$GP” messages. 2. After AT+KTCPCLOSE=1 - I send AT+GNSSNMEA=04 - but receive nothing, need to restart again GNSS by sending the GNSSSTART=0 command. For example, “$GPRMC, **000008.00** ,V,060180,N,\*56”. 3. Sending/receiving data, “+KTCP\_NOTIF: 1,4” - stop GNSS, need again restart GNSS. Additional data - init of GNSS module - all Sierra defaults - only “AT+GNSSSTOP”, “AT+GNSSSTART=0”, “AT+GNSSNMEA=04”, “+++” Previously I tried also to configure GNSS, but the result was the same - “AT+GNSSLOC?” receive “+GNSSLOC: FIX NOT AVAILABLE”: AT+GNSSSTOP AT+GNSSCONF=10,1 AT+GNSSNMEA=0,1000,0,1FF AT+GNSSSTART=0 AT+GNSSNMEA=04 +++ I receive the following messages: $GPGGA,001004.00,0,00,\*4D $GPGSV,1,1,03,05,29,15,25,29,24,\*7A $GPGNS,001004.00,NN,00,\*66 $GPRMC,001004.00,V,060180,N,\*5B $GPGST,001004.00,\*7C $GPGGA,001005.00,0,00,\*4C $GPGSV,1,1,03,05,28,15,24,29,23,\*7D $GPGNS,001005.00,NN,00,\*67 $GPRMC,001005.00,V,060180,N,\*5A $GPGST,001005.00,\*7D What I do wrong? Why the "$GP " data is stopped to arrive? Additional about TCP connection: +++ [31-10 13:30:56 TRACE] GSM-FIN\_3: AT ERROR [31-10 13:30:56 TRACE] GSM-FIN\_3: AT OK [31-10 13:30:57 TRACE] GSM-FIN\_3: ATE0 OK [31-10 13:30:57 TRACE] GSM-FIN\_3: AT+CCID +CCID: 89332401000013998519 OK [31-10 13:30:58 TRACE] GSM-FIN\_3: AT+CNUM OK [31-10 13:30:58 INFO] GSM-FIN\_3: My phone number:\<\> [31-10 13:30:58 TRACE] GSM-FIN\_3: AT+CNMI=1,0,0,0 OK [31-10 13:30:59 TRACE] GSM-FIN\_3: AT+CSQ +CSQ: 16,7 OK [31-10 13:30:59 TRACE] GSM-FIN\_3: AT+CCLK? +CCLK: “19/10/31,13:34:53-16” OK [31-10 13:31:00 TRACE] GSM-FIN\_3: AT+CGDCONT=1,“IP”,“internet.swir”,0,0,0, OK [31-10 13:31:01 TRACE] GSM-FIN\_3: AT+CREG? +CREG: 2,5,“6202”,“0103CE07”,7 OK [31-10 13:31:01 TRACE] GSM-FIN\_3: AT+KCNXCFG=1,“GPRS”,“internet.swir”,"","",“IPV4”,“0.0.0.0”,"0.0.0.0 OK [31-10 13:31:02 TRACE] GSM-FIN\_3: AT+KTCPCFG=1,0,“[wd.bdlogix.com](http://wd.bdlogix.com)”,2020 +KTCPCFG: 1 OK [31-10 13:31:02 TRACE] GSM-FIN\_3: AT+KTCPCNX=1 OK +KCNX\_IND: 1,1,0 [31-10 13:31:03 TRACE] GSM-FIN\_3: AT+KCGPADDR +KCGPADDR: 1,“100.71.124.11” OK [31-10 13:31:03 TRACE] GSM-FIN\_3: GSM\_COMMAND\_MODE state [31-10 13:31:10 TRACE] GSM-FIN\_3: GPS\_INIT state [31-10 13:31:10 TRACE] GSM-FIN\_3: AT +KTCP\_IND: 1,1 OK [31-10 13:31:11 TRACE] GSM-FIN\_3: AT+GNSSSTOP +CME ERROR: 3 [31-10 13:31:13 TRACE] GSM-FIN\_3: AT+GNSSSTART=0 [31-10 13:31:13 TRACE] GSM-FIN\_3: Conn request [31-10 13:31:13 TRACE] GSM-FIN\_3: Conn request started [31-10 13:31:15 TRACE] GSM-FIN\_3: OK +GNSSEV: 0,1 +GNSSEV: 1,1 [31-10 13:31:15 TRACE] GSM-FIN\_3: AT OK [31-10 13:31:15 TRACE] GSM-FIN\_3: AT+GNSSSTART=0 OK +GNSSEV: 1,0 [31-10 13:31:18 TRACE] GSM-FIN\_3: AT OK [31-10 13:31:19 TRACE] GSM-FIN\_3: AT+KTCPSTART=1 CONNECT ---
**Author:** ![Donald](https://avatars.discourse-cdn.com/v4/letter/d/ac8455/32.png) [@Donald](https://forum.sierrawireless.com/u/Donald)\ **Post date:** [November 12, 2019, 9:05am UTC](https://forum.sierrawireless.com/t/gnss-stop-to-work/18140/2 "2019-11-12T09:05:05Z")
Hi, On altair 1250 platform HL7800, the GNSS share the same RF Rx chain with cellular (2G/LTE-M). Because cellular reception has an higher priority, GNSS should be allowed to work only when LTE modem is: Switched-off (AT+CFUN=0) In flight-mode (AT+CFUN=4) In PSM sleep mode In Idle-DRX/eDRXmode To obtain a lock GNSSSEV:3,2 or GNSSSEV:3,3. Please make sure your HL7800 is attached to a GPS atten and a GPS signal environments such as an open sky or repeater GPS in a building. Here is result on my module ATI3 18:18:26.355 on 08-Nov-2019\> 18:18:26.355 on 08-Nov-2019\> BHL7800:E0.3.7.2.3.20191030 18:18:26.355 on 08-Nov-2019\> 18:18:26.355 on 08-Nov-2019\> OK 18:18:34.219 on 08-Nov-2019\> AT+CFUN=0 18:18:37.210 on 08-Nov-2019\> 18:18:37.230 on 08-Nov-2019\> OK 18:18:37.230 on 08-Nov-2019\> 18:18:37.230 on 08-Nov-2019\> +CEREG: 0 18:18:37.230 on 08-Nov-2019\> AT+GNSSSTART=0 18:20:06.195 on 08-Nov-2019\> 18:20:06.195 on 08-Nov-2019\> OK 18:20:06.195 on 08-Nov-2019\> 18:20:06.195 on 08-Nov-2019\> +GNSSEV: 0,1 18:20:06.195 on 08-Nov-2019\> 18:20:06.466 on 08-Nov-2019\> +GNSSEV: 1,1 18:20:06.466 on 08-Nov-2019\> 18:20:09.270 on 08-Nov-2019\> +GNSSEV: 3,0 18:20:09.270 on 08-Nov-2019\> 18:20:59.504 on 08-Nov-2019\> +GNSSEV: 3,3 ---
**Author:** ![anna\_lel](https://avatars.discourse-cdn.com/v4/letter/a/c37758/32.png) [@anna\_lel](https://forum.sierrawireless.com/u/anna_lel)\ **Post date:** [January 29, 2020, 9:18pm UTC](https://forum.sierrawireless.com/t/gnss-stop-to-work/18140/3 "2020-01-29T21:18:13Z")
Thank you Donald, this was my problem - now I stop GSM and start GNSS with AT+CFUN=0. Now, I can receive a fixed location event.