It should be possible to start RTDE connection with no output variables registered

[michal-milkowski]

Client library, and controller code expect at least one output variable before starting data synchronization. This behavior is both unexpected, and difficult to handle for clients that only want to write input variables.

Proposed solution: TBD, might require code change on RTDE server side.

[robot-ranger]

we just send a watchdog recipe, but dont implement it in urscript.

i know thats not exactly the issue youre suggesting and it does consume an output, but it does allow the connection to go