.. _iso_connected_benchmark:

Bluetooth: Throughput
#####################

The ISO Connected Channels Benchmark sample measures and reports packet loss
and sync loss in connected ISO channels.


Overview
********

The sample transmits data between the *central* and the *peripheral*
and measures the quality of the ISO channels.

The application can be used as both a central and a peripheral, and the mode
can easily be changed.

Requirements
************

* BlueZ running on the host, or
* A board with Bluetooth Low Energy 5.2 support
* A Bluetooth Controller and board that supports setting
  CONFIG_BT_CTLR_CENTRAL_ISO=y
* A remote board running the same sample as the reversed role that supports
  setting CONFIG_BT_CTLR_PERIPHERAL_ISO=y

Building and running
********************

This sample can be found under
:zephyr_file:`samples/bluetooth/iso_connected_benchmark` in the Zephyr tree.

See :ref:`bluetooth samples section <bluetooth-samples>` for details.


Testing
=======

After programming the sample to both boards, test it by performing the following
steps:

1. Connect to both boards with a terminal emulator (for example, PuTTY or
   minicom).
#. Reset both boards.
#. In one of the terminal emulators, type "c" to start the application on the
   connected board in the central role.
#. In the other terminal emulator, type "p" to start the application in the
   peripheral role.
#. Optionally modify the central ISO settings using the console.
#. Observe that the central and the peripheral connects.
#. Observe the receive statistics on the devices (the connected ISO channels may
   by uni- or bidirectional).

Sample output
==============
The peripheral will output overall data (since boot),
current connection (since the CIG was connected) and latest 1000 received
packets::

  *** Booting Zephyr OS build zephyr-v2.5.0-4098-gdcaaee6db2f5  ***
   [00:00:00.392,333] <inf> iso_connected: Starting Bluetooth Throughput example
   [00:00:00.405,395] <inf> iso_connected: Bluetooth initialized
   Choose device role - type c (central role) or p (peripheral role), or q to quit: p
   Peripheral role
   [00:00:10.281,555] <inf> iso_connected: Registering ISO server
   [00:00:10.281,555] <inf> iso_connected: Starting advertising
   [00:00:10.282,684] <inf> iso_connected: Waiting for ACL connection
   [00:00:16.711,517] <inf> iso_connected: Connected: FA:4C:4B:DB:D3:89 (public)
   [00:00:16.711,669] <inf> iso_connected: Waiting for ISO connection
   [00:00:16.802,856] <inf> iso_connected: Incoming ISO request
   [00:00:16.802,856] <inf> iso_connected: Returning instance 0
   [00:00:17.016,845] <inf> iso_connected: ISO Channel 0x20002934 connected
   [00:00:17.769,439] <inf> iso_connected: Sending value 100
   [00:00:17.774,902] <inf> iso_connected: Overall     : Received 100/100 (100.00%) - Total packets lost 0
   [00:00:17.774,932] <inf> iso_connected: Current Conn: Received 100/100 (100.00%) - Total packets lost 0
   [00:00:17.774,963] <inf> iso_connected: Latest 1000 : Received 100/100 (100.00%) - Total packets lost 0
   [00:00:17.774,963] <inf> iso_connected:
   [00:00:18.529,510] <inf> iso_connected: Sending value 200
   [00:00:18.532,409] <inf> iso_connected: Overall     : Received 200/200 (100.00%) - Total packets lost 0
   [00:00:18.532,470] <inf> iso_connected: Current Conn: Received 200/200 (100.00%) - Total packets lost 0
   [00:00:18.532,501] <inf> iso_connected: Latest 1000 : Received 200/200 (100.00%) - Total packets lost 0


The central will ask if any changes to the current settings are wanted.
If y/Y is chosen, then it will create a prompt to changes the settings,
otherwise continue with the current settings. The central will then start
scanning for and connecting to a peer device running the sample as peripheral
role. Once connected, the central will output overall data (since boot),
current connection (since the CIG was connected) and latest 1000 received
packets::

   *** Booting Zephyr OS build zephyr-v2.5.0-4098-gdcaaee6db2f5  ***
   [00:00:00.459,869] <inf> iso_connected: Starting Bluetooth Throughput example
   [00:00:00.472,961] <inf> iso_connected: Bluetooth initialized
   Choose device role - type c (central role) or p (peripheral role), or q to quit: c
   Central role
   Change ISO settings (y/N)?
   [00:00:03.277,893] <inf> iso_connected: Scan started
   [00:00:03.277,893] <inf> iso_connected: Waiting for advertiser
   [00:00:03.899,963] <inf> iso_connected: Found peripheral with address F4:5A:12:BF:4F:2C (public) (RSSI -24)
   [00:00:03.900,024] <inf> iso_connected: Stopping scan
   [00:00:03.908,020] <inf> iso_connected: Scan stopped
   [00:00:03.908,020] <inf> iso_connected: Connecting
   [00:00:04.007,232] <inf> iso_connected: Connected: F4:5A:12:BF:4F:2C (public)
   [00:00:04.007,354] <inf> iso_connected: Binding ISO
   [00:00:04.007,812] <inf> iso_connected: Connecting ISO channels
   [00:00:04.312,744] <inf> iso_connected: ISO Channel 0x20002934 connected
   [00:00:05.065,368] <inf> iso_connected: Sending value 100
   [00:00:05.072,052] <inf> iso_connected: Overall     : Received 100/100 (100.00%) - Total packets lost 0
   [00:00:05.072,113] <inf> iso_connected: Current Conn: Received 100/100 (100.00%) - Total packets lost 0
   [00:00:05.072,143] <inf> iso_connected: Latest 1000 : Received 100/100 (100.00%) - Total packets lost 0
   [00:00:05.072,143] <inf> iso_connected:
   [00:00:05.825,439] <inf> iso_connected: Sending value 200
   [00:00:05.829,589] <inf> iso_connected: Overall     : Received 200/200 (100.00%) - Total packets lost 0
   [00:00:05.829,620] <inf> iso_connected: Current Conn: Received 200/200 (100.00%) - Total packets lost 0
   [00:00:05.829,650] <inf> iso_connected: Latest 1000 : Received 200/200 (100.00%) - Total packets lost 0