apps/bttester: send disconnected event in case of l2cap conn req failure

This change allows sending a BTP_L2CAP_EV_DISCONNECTED event containing
an error code when L2CAP Connection request is rejected. Previously,
no tester event was triggered in this scenario, which made it impossible
to determine the reason for the connection failure.

Author: piotrnarajowski

apps/bttester/src/btp_l2cap.c

@@ -207,17 +207,23 @@ connected_cb(uint16_t conn_handle, struct ble_l2cap_chan *chan,
 
 static void
 disconnected_cb(uint16_t conn_handle, struct ble_l2cap_chan *chan,
-                struct ble_l2cap_chan_info *chan_info, void *arg)
+                struct ble_l2cap_chan_info *chan_info, int status, void *arg)
 {
     struct btp_l2cap_disconnected_ev ev;
     struct ble_gap_conn_desc desc;
     struct channel *channel;
 
     memset(&ev, 0, sizeof(struct btp_l2cap_disconnected_ev));
 
-    channel = find_channel(chan);
-    assert(channel != NULL);
+    if (status != 0) {
+        /* Conection request failed */
+        channel = get_free_channel();
+    } else {
+        channel = find_channel(chan);
+        assert(channel != NULL);
+    }
 
+    ev.result = status;
     ev.chan_id = channel->chan_id;
     ev.psm = chan_info->psm;
 
@@ -266,6 +272,8 @@ tester_l2cap_event(struct ble_l2cap_event *event, void *arg)
 
         if (event->connect.status) {
             console_printf("LE COC error: %d\n", event->connect.status);
+            disconnected_cb(event->connect.conn_handle, event->connect.chan,
+                            &chan_info, (uint8_t)event->connect.status, arg);
             return 0;
         }
 
@@ -290,8 +298,8 @@ tester_l2cap_event(struct ble_l2cap_event *event, void *arg)
         console_printf("LE CoC disconnected, chan: 0x%08lx\n",
                        (uint32_t) event->disconnect.chan);
 
-        disconnected_cb(event->disconnect.conn_handle,
-                        event->disconnect.chan, &chan_info, arg);
+        disconnected_cb(event->disconnect.conn_handle, event->disconnect.chan,
+                        &chan_info, (uint8_t)event->connect.status, arg);
         return 0;
     case BLE_L2CAP_EVENT_COC_ACCEPT:
         ble_l2cap_get_chan_info(event->accept.chan,