W: conn failed to establish. RF noise?

Question

deleted

Susheel Nuguru · Accepted Answer

Hi Nick, 
 Can you please tell us more on your test setup and also show us the console output where you see the warning you mentioned? It sounds like a configuration issue with the software but I can try to assist you more after you provide more information that I requested.

Susheel Nuguru · Answer

Isn't this the same issue as mentioned here ? 
 Yes, the infinite loop seems wrong like you already suspected and it is better to have a timeout and move on. I suggest the below for the cleanup code 
 if (k_sem_take(&sem_connected, K_SECONDS(4)) != 0) {
 printk("W: Connection to device %d timed out. Skipping...
", i);
 if (connections[i]) {
 bt_conn_disconnect(connections[i], BT_HCI_ERR_REMOTE_USER_TERM_CONN);
 bt_conn_unref(connections[i]);
 connections[i] = NULL;
 }
 continue; // Move on to the next device
}

Susheel Nuguru · Answer

Also please do not open multiple threads on the same issue and please close on of these two threads.

Susheel Nuguru · Answer

Yes, Please share you whole project zipped. I need to see what your code is doing in other callbacks like connected(). I also need to see how you are giving the semaphore sem_connected.

NickDeLeenheer · Answer

deleted

Susheel Nuguru · Answer

There is a bug in your code, in the connected_cb() you are not giving the semaphore when the connection fails. 
 So when there is a connection failure your main loop is stuck. You also still have k_sem_take waiting for K_FOREVER. 
 I suggest you one of the two changes 
 1) In your connected_cb() 
 static void connected_cb(struct bt_conn *conn, uint8_t err)
{
 if (err) {
 LOG_ERR("Connection failed (err 0x%02x)", err);
 bt_conn_unref(conn);
 k_sem_give(&sem_connected); // ADD THIS NEW LINE ADDED SUSHEEL
 return;
 }

/* On success the same give(), which you are doing already. */
 k_sem_give(&sem_connected);
 …
} 
 2) Make sure your k_sem_take are not waiting for ever and PLEASE DO NOT IGNORE RETURN VALUES of function calls like k_sem_take

Susheel Nuguru · Answer

Assuming that you are able to reproduce this on DK, Can you please attach your minimalistic project so that I can reproduce this on my desk and find out the reason for this. This will avoid a lot of ping pong questions and let me dive straight to debugging.

W: conn failed to establish. RF noise?

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