Number/string signalValue=sim.waitForSignal(string signalName)
The function is equivalent to:
signalValue=nil
while (signalValue==nil) do
signalValue=sim.getIntegerSignal(signalName) or sim.getFloatSignal(signalName) or
sim.getStringSignal(signalName)
if (signalValue==nil) then
sim.switchThread()
end
end
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