Unable to interface SparkFun LTE SARA-R4 Shield with ZED-F9P GPS

GPS/GNSS Development Boards
1

Hello,

I am attempting to communicate between the ZED-F9P GPS Module and the SARA-R4 Shield to get RTK corrections over LTE. I have followed the hookup Guide to connect the LTE Shield to the internet successfully, however I have not been able to get the ZED-F9P to use the shield for an internet connection, is anyone able to provide guidance on how to configure the ZED-F9P module to get internet through the SARA-R4 Shield?

Thanks in advance

2

Hi CroptimusPrime,

Unfortunately, we do not have a full tutorial available to go over this project step-by-step but I have a couple of suggestions that might help you get started. First, have you been able to get any data from the ZED-F9P through your LTE Shield to whatever network you are connected to or even just communicating between the ZED-F9P and the LTE Shield with [this example from the LTE Shield Library?

The next step gets tricky since you need to connect the LTE Shield to a correction source and then pipe that RTCM data through the LTE Shield and out to the ZED-F9P. Our [example from the RTK2 GPS Hookup Guide might help you with this next step but that example uses a Bluetooth connection and a data stream from NTRIP. Adapting this to work with the LTE Shield may not work with the [LTE Shield Arduino Library so you may need to refer to the [AT Command Set for the SARA-R4. You can use the Serial Passthrough example from the LTE Shield Arduino Library to talk to the SARA-R4 directly with AT Commands.

I hope this helps you get started with this project. Going beyond this is a bit out of scope for our support but if you have any further questions we would be happy to try and help answer them or at least point you in the right direction to find an answer.](https://www.u-blox.com/sites/default/files/SARA-R4-SARA-N4_ATCommands_(UBX-17003787).pdf)](GitHub - sparkfun/SparkFun_LTE_Shield_Arduino_Library: Arduino Library for the SparkFun LTE Cat M1/NB-IoT Shield.)](GPS-RTK2 Hookup Guide - SparkFun Learn)](SparkFun_LTE_Shield_Arduino_Library/examples/06_GPS_GPRMS/06_GPS_GPRMS.ino at master · sparkfun/SparkFun_LTE_Shield_Arduino_Library · GitHub)