changed client_conn_timeout

misc.h

@@ -43,7 +43,7 @@ const u32_t timer_interval=400;//ms. this should be smaller than heartbeat_inter
 const uint32_t conv_timeout=120000; //ms. 120 second
 //const u32_t conv_timeout=30000; //for test
 
-const u32_t client_conn_timeout=15000;//ms.
+const u32_t client_conn_timeout=10000;//ms.
 const u32_t client_conn_uplink_timeout=client_conn_timeout+2000;//ms
 
 const uint32_t server_conn_timeout=conv_timeout+60000;//ms. this should be 60s+ longer than conv_timeout,so that conv_manager can destruct convs gradually,to avoid latency glicth