https://devzone.nordicsemi.com/f/nordic-q-a/47092/is-an-hvn-tx-queue-allocated-per-characteristicI&#39;m wondering about how the notification queues are allocated when setting hvn_tx_queue_size using ble_cfg.conn_cfg.params.gatts_conn_cfg.hvn_tx_queue_size. If I set it to some length, say 30, does that mean that a queue of size ( 30 * max_characteristic_lengthen-USTelligent Community 13Thu, 09 May 2019 04:14:01 GMThttps://devzone.nordicsemi.com/thread/186051?ContentTypeID=1Thu, 09 May 2019 04:14:01 GMT137ad170-7792-4731-bb38-c0d22fbe4515:ffec8d2b-3314-4bcc-8140-cba750f6da6bAndy<p>No, it&#39;s a single queue that the softdevice&nbsp;uses to send notifications to everything, i.e. to all characteristics from all services of every peripheral link.</p> <p>Having a bigger queue just means that you&#39;ll be able to queue more notifications before you get NRF_ERROR_RESOURCES. And this can happen no matter what the queue size is. For example, if you call sd_ble_gatts_hvx in a for loop you will only be able to queue X notifications before you get errors.</p> <p>You have to handle these errors somehow. A popular approach is clearing a flag on HVX_TX_COMPLETE.</p><div style="clear:both;"></div>