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In the SPOP protocol, ACK frame with empty payload are allowed. However, in that case, because only the payload is transferred, there is no data to return to the SPOE applet. Only the end of input is reported. Thus the applet is never woken up. It means that the SPOE filter will be blocked during the processing timeout and will finally return an error. To workaournd this issue, a NOOP action is introduced with the value 0. It is only an internal action for now. It does not exist in the SPOP protocol. When an ACK frame with an empy payload is received, this noop action is transferred to the SPOE applet, instead of nothing. Thanks to this trick, the applet is properly notified. This works because unknown actions are ignored by the SPOE filter. This patch must be backported to 3.1.