promise based methods

[ikwilnaarhuisman]

in PR #1169 I added callServiceAsync to Service which is just a promise based wrapper around the regular callRosService.

Do we want this for other things too?

Say sendGoal for example for Action?

[MatthijsBurgh]

I think this is a good idea.

Though is it possible to make the sync function wrap the async function? Instead of the async function wrapping the sync function.

[ikwilnaarhuisman]

Yeah so we can deprecate the sync ones in a 3.x?

Sounds like a good idea.

[ikwilnaarhuisman]

in #1166 @cn1001wang said that he added promise based Params and Services .

It looks pretty good: https://github.com/cn1001wang/roslib-ts/blob/v1.0.0/src/Param.ts