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You probably want something like:

def Receive(req):
#Motion= ALproxy("ALMotion")
    names = "HeadYaw"
    fractionMaxSpeed = 0.1
    useSensors  = True 
    HeadYaw = Motion.getAngles(names, useSensors)
    Motion.setAngles(names, req.HeadYawSet,fractionMaxSpeed)
    names = "HeadPitch"
    HeadPitch=Motion.getAngles(names, useSensors)
    Motion.setAngles(names, req.HeadPitchSet, fractionMaxSpeed)

    # new code 
    resp = headResponse()
    resp.HeadYaw= HeadYaw
    resp.HeadPitch= HeadPitch
    return resp

Assuming that your service is in a file called head.srv

Note that for headResponse to be defined you may also need to add a line like this towards the top of your source:

from your_pkg.srv import *