Fix bug in MQTTS topic registration (issue #5)#6
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If a MQTTS client missed a SUBACK and consequently resent the SUBSCRIBE, rsmb would send the next SUBACK with a different topic id. But later PUBLISHes on that topic would use the first topic id which was unknown to the client. Fix is to use the same check for a previously registered topic in MQTTSProtocol_handleSubscribes that MQTTSProtocol_handleRegisters uses.
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If a MQTTS client missed a SUBACK and consequently resent the SUBSCRIBE,
rsmb would send the next SUBACK with a different topic id. But later
PUBLISHes on that topic would use the first topic id which was unknown
to the client.
Fix is to use the same check for a previously registered topic in
MQTTSProtocol_handleSubscribes that MQTTSProtocol_handleRegisters uses.