Heartbeat timeout retry

mirai-core-timpc/src/commonMain/kotlin/net.mamoe.mirai.timpc/network/TIMPCBotNetworkHandler.kt

@@ -473,7 +473,13 @@ internal class TIMPCBotNetworkHandler internal constructor(coroutineContext: Cor
 
                                         HeartbeatPacket(bot.qqAccount, sessionKey).sendAndExpect<HeartbeatPacketResponse>()
                                     } == null) {
+
+                                    // retry one time
+                                    if (withTimeoutOrNull(configuration.heartbeatTimeoutMillis) {
+                                            HeartbeatPacket(bot.qqAccount, sessionKey).sendAndExpect<HeartbeatPacketResponse>()
+                                        } == null) {
                                         bot.logger.warning("Heartbeat timed out")
+
                                         delay(configuration.firstReconnectDelayMillis)
                                         bot.tryReinitializeNetworkHandler(HeartbeatTimeoutException())
                                         return@launch
@@ -481,6 +487,7 @@ internal class TIMPCBotNetworkHandler internal constructor(coroutineContext: Cor
                                 }
                             }
                         }
+                    }
 
                     bot.logger.info("Successfully logged in")
                     loginResult.complete(null)