SIM868 Debug

Problem: Can not correctly receive the GNSS output

AT+CGNSINF
+CGNSINF: 0,,,,,,,,,,,,,,,,,,,,

• This is a problem of the latest simcom firmware, it does not happened in old modules, but in new modules.
• The GNSS output port baudrate at 9600, but UART2 baudrate is not at 9600 by default, these two should be set to match

Solve:

• Set the correct baudrate for UART2 before to receive GPS data
• by commands AT+CGNSIPR=9600

• We tested all units before send, but the commands data maybe not saved into module, we are still looking for better solutions?

send PMTK commands

AT+CGNSCMD=0,"$PMTK000*32"

Version

AT+GSV

SIMCOM_Ltd
SIMCOM_SIM868
Revision:1418B03SIM868M32_OFO

AT+CGNSVER

AXN_5.0_3333_17022400,0000,B03V02SIM868_11,

check GNSS version

AT+CGNSVER
AXN_3.82_3333_16092900,0000,,*2A

AXN_5.0_3333_17022400,0000,B03V02SIM868_11,