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

  • A board with Bluetooth Low Energy 5.2 and Connected Isochronous Channel support

  • A remote board running the same sample as the reversed role

Building and running

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

See bluetooth samples section 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).

  2. Reset both boards.

  3. In one of the terminal emulators, type “c” to start the application on the connected board in the central role.

  4. In the other terminal emulator, type “p” to start the application in the peripheral role.

  5. Optionally modify the central ISO settings using the console.

  6. Observe that the central and the peripheral connects.

  7. 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