sendingMessageList
removeByClientMsgId
messageHadReceived(clientMsgId)
定时任务
messageSendFail(clientMsgId)
service
insert()&clearResendCount
checkSendingListCount
fail
checkClientMsgId()
checkCount++
消息发送器
消息接收器
updateStatus('received')
checkCount2
sendFailMessageList
received
updateStatus('fail')
msg-xxx（local）
