Number/string signalValue=simWaitForSignal(string signalName)
The function is equivalent to:
signalValue=nil
while (signalValue==nil) do
signalValue=simGetIntegerSignal(signalName) or simGetFloatSignal(signalName) or
simGetStringSignal(signalName)
if (signalValue==nil) then
simSwitchThread()
end
end
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