l2cap: stop ertm timers in l2cap_free_channel_entry

CHANGELOG.md

@@ -11,6 +11,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 ### Fixed
 - RFCOMM: accept incoming L2CAP connection in Basic mode if ERTM is enabled but not requested for this connection
 - POSIX, WICED, Windows, FreeRTOS: handle time_ms overrun after 49 days
+- L2CAP ERTM: stop timers on disconnect
 
 ### Added
 - btstack_run_loop_base: portable implementation of timer and data source managment as base for platform specific implementations

src/l2cap.c

@@ -1867,8 +1867,12 @@ static l2cap_channel_t * l2cap_create_channel_entry(btstack_packet_handler_t pac
 
 static void l2cap_free_channel_entry(l2cap_channel_t * channel){
     log_info("free channel %p, local_cid 0x%04x", channel, channel->local_cid);
-    // assert rts/ertx timers are stopped
+    // assert all timers are stopped
     l2cap_stop_rtx(channel);
+#ifdef ENABLE_L2CAP_ENHANCED_RETRANSMISSION_MODE
+    l2cap_ertm_stop_retransmission_timer(channel);
+    l2cap_ertm_stop_monitor_timer(channel);
+#endif
     // free  memory
     btstack_memory_l2cap_channel_free(channel);
 }