Question about using GPSd & ubxtool for ADR implmentation

[Aaron Wheeler]

Hello GPSd email list,

  We have an application where we want to use the u-blox ADR module in ADR mode. For this application, we want to feed the receiver vehicle speed information using the ESF-MEAS message.  To accomplish this, we would need to send a CFG-ESFWT message for configuration, followed by a periodic ESF-MEAS message, containing the vehicle speed.  We have investigated ubxtool and its messages for a possible solution, but it seems that ubxtool is mostly for enabling output messages from receiver.  

Is there the ability to use ubxtool to send down the CFG-ESFTW & ESF-MEAS messages, at rates of at least 10Hz?

In GPSd, I do see the ability to send messages to the GPSd daemon.  Barring an implementation in ubxtool, is there a GPSd message that could be used to send a serial data packet down to a receiver, to implement such a design?   

Best regards,

-Aaron Wheeler