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Fix the bug that heartbeat ping not working properly#65
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I found this bug when I use modified surgemq in a emulator to profiling GoQuic with respect to TCP. (It has been a dozen of days since I do this modification so I forgot some details...)
The bug is functiuon processAcked(ackq *sessions.Ackqueue) in "process.go" will always try to decode the MsgBuf and will always fail on Ping/PingAck message because it is not given one during initialization. The high level code can not get any pingback semantic though the low level code actually send PING.
I fix this by attach a msgBuf with the message.