this problem happened some time at two Peripherals,and BLE stack version is 1.4，there are no server and characteristics after connected，this state lasts for a long time ,until disconnected for timeout,it can advertsing ,when we connected it again,there are no server and characteristics ,even if we use our app or lightblue, sniffer picture as followe: Master sends ATT_Exchange_MTU_Req ,but Slaver has no response,how this happened?
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