Help sending PAIR/PQTM commands via transmitAT() on the mobile station (SKU: KIT0198-EU)

Hi,

 

I'm trying to send configuration commands (like $PAIR063 or other PQTM commands) to my mobile station's GNSS module using transmitAT() from the DFRobot_RTK_LoRa library, over I2C on a Raspberry Pi.

 

I can get it working with the exact example from configParam.ino ($PQTMVERNO), and I get a correct response back. But when I try other commands, I never get anything back — it either times out or just repeats the previous response instead of a new one.

 

Could you help with:

Is there a recommended way to use transmitAT() for commands other than the version query in the example? Maybe I'm missing a step (waiting longer, resetting something between commands, a specific mode to be in, etc.)? Is there a newer firmware available for the mobile station's relay board? Also, I noticed the schematics download on the wiki only includes the base station board. Would it be possible to get the schematic (or just the GNSS module pinout) for the mobile station board too? I'd like to be able to wire directly to the GNSS module as a backup option if needed. 

 

Thanks a lot!

eboustou