Way to update a TLM item based on sending a command

[mkalin2]

Lets say I have a stepper motor driver, and I want to keep track of the total number of steps that I have commanded to the motor. Is there a way to have the 'motor move' command packet update a TLM packet that will accumulate the number of steps across the command sender and various scripts?

It seems like I could do this using a write conversion and a virtual TLM packet. I am unsure of how I to access the TLM packet from the conversion however. I am also unsure of how I could reset this TLM value without actually sending a command to my motor driver board...

Is this possible and if so am I on the right track?

[jmthomas]

You can certainly do this with "fake" telemetry packets and by calling inject_tlm to update it. However I would recommend using the Stash API which was created for just this use case. Store something internally and then retrieve it.

[mkalin2]

I would like this to work even if the command is sent via the command sender. Will I be able to update the stashed value outside of a script?

[mkalin2]

Like is there a way to implement a custom telemetry item like RECIVED_COUNT that gets updated based on things that happen in COSMOS rather than by info in the packet.

[jmthomas]

You could create a command VALIDATOR that does an inject_tlm like I mentioned above to save whatever values you want in an existing telemetry packet.