I have some major issues regarding GNSS integrated inside HL6528G-2.8V module. I will try to specify as precisely as posible what is happening.
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When device is operating on a viechle that passes from one base station to another and somethimes losses signal and connection to the network. After it connects again to the network and regain TCP/IP connection to the server sometimes „AT+GPSPVT=4,0,3/r/n“ command doesn’t return any “+GPSPVT” answers and only thing that I can do is issue „AT+GPSSTART=0/r/n“ command to restart it.
Problem is that than it losses all satelites and coordinates and I have to wait to regain them like it had hard reset.(complete start from power off state)
This happends to often: 1 of 10 times when reconnecting to network -
Next thing is that when viechle moves (tested scenario is 80km/h), and „AT+GPSSTART=0/r/n“ comand is issued sometimes it takes up to 10min to TTFF (get coordinates), this happends very rare but we never can wait that long.
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Further issue is about height information that doesn’t exists (it never shows it)… this is on all modules and firmwares I tested, you can try it also.
weather is NMEA or GPSPVT mesages.
Example(bold is height):
+GPSPVT: 0,23:01:11,28/10/2014,3D FIX,N 45 09’07.25",E 014 32’18.66",+0000m
+GPSPVT: 1,066.7deg,000m/s
I have latest vesion of firmware:
23:04:08.401> ATI3
23:04:08.401>
23:04:08.430> SIERRA HL6N,002.00.200F.7152A
23:04:08.430>
23:04:08.430> OK
There are some more issues with reconections when signal is lost and regained but that I can handle. IMPORTANT IS THAT GNSS ALWAYS HAVE COORDINATES AND NEVER RESETS!!!
Are this issues happening only to me or is it HL6528G firmware issue?
Best Regards,
Marjan