1.. zephyr:code-sample:: bluetooth_isochronous_broadcaster_benchmark
2 :name: Isochronous Broadcaster Benchmark
3 :relevant-api: bt_iso bluetooth
4
5 Measure packet loss and sync loss of an ISO broadcaster against one or more receivers.
6
7The ISO Broadcast Benchmark sample measures and report packet loss and sync loss
8of an ISO broadcaster against one or more ISO broadcast receivers.
9
10Overview
11********
12
13The sample transmits data from the *broadcaster* to the
14*receiver* (multiple receivers may be used with no effect on the test)
15and measures the quality of the sync.
16
17The application is used as both a broadcaster and a receiver, and the mode
18can easily be changed.
19
20Requirements
21************
22
23* BlueZ running on the host, or
24* A board with Bluetooth Low Energy 5.2 support
25* A Bluetooth Controller and board that supports setting
26 CONFIG_BT_CTLR_ADV_ISO=y
27* A remote board running the same sample as the reversed role that supports
28 setting CONFIG_BT_CTLR_SYNC_ISO
29
30Building and running
31********************
32
33This sample can be found under
34:zephyr_file:`samples/bluetooth/iso_broadcast_benchmark` in the Zephyr tree.
35
36See :zephyr:code-sample-category:`bluetooth` samples for details.
37
38
39Testing
40=======
41
42After programming the sample to both boards, test it by performing the following
43steps:
44
451. Connect to both boards with a terminal emulator (for example, PuTTY or
46 minicom).
47#. Reset both boards.
48#. In one of the terminal emulators, type "r" to start the application on the
49 connected board in the receiver role.
50#. In the other terminal emulator, type "b" to start the application in the
51 broadcaster role.
52#. Optionally modify the broadcasting settings.
53#. Observe that the receiver synchronizes to the broadcaster.
54#. Observe the receive statistics on the receiver(s).
55
56Sample output
57==============
58The receiver will output statistics for overall (since boot), current sync
59(since the BIG was synced) and latest 1000 received packets::
60
61 *** Booting Zephyr OS build zephyr-v2.5.0-3768-g42f09317bfbe ***
62 [00:00:00.447,845] <inf> iso_broadcast_main: Starting Bluetooth Throughput
63 Choose device role - type r (receiver role) or b (broadcaster role), or q to quit: r
64 Receiver role
65 [00:00:05.784,698] <inf> iso_broadcast_receiver: Scan started
66 [00:00:05.784,698] <inf> iso_broadcast_receiver: Waiting for periodic advertiser
67 [00:00:05.793,304] <inf> iso_broadcast_receiver: Found broadcaster with address 28:3B:AD:F5:EE:0C (random) (RSSI -33)
68 [00:00:05.793,334] <inf> iso_broadcast_receiver: Periodic advertiser found
69 [00:00:05.793,701] <inf> iso_broadcast_receiver: Scan stopped
70 [00:00:05.793,701] <inf> iso_broadcast_receiver: Creating Periodic Advertising Sync
71 [00:00:05.796,081] <inf> iso_broadcast_receiver: Waiting for periodic sync
72 [00:00:06.453,460] <err> bt_scan: Unknown handle 0x0000 for periodic advertising report
73 [00:00:06.453,979] <inf> iso_broadcast_receiver: Periodic advertisement synced
74 [00:00:06.454,010] <inf> iso_broadcast_receiver: Periodic sync established
75 [00:00:06.454,040] <inf> iso_broadcast_receiver: Waiting for BIG info
76 [00:00:08.853,485] <inf> iso_broadcast_receiver: BIGinfo received: num_bis 2, nse 1, interval 7 ms, bn 1, pto 0, irc 1, max_pdu 251, sdu_interval 7500 us, max_sdu 251, phy LE 2M, without framing, not encrypted
77 [00:00:08.853,515] <inf> iso_broadcast_receiver: Syncing to BIG
78 [00:00:08.853,973] <inf> iso_broadcast_receiver: Waiting for BIG sync
79 [00:00:11.254,211] <inf> iso_broadcast_receiver: ISO Channel 0x2000124c connected
80 [00:00:11.254,333] <inf> iso_broadcast_receiver: BIG sync established
81 [00:00:11.254,486] <inf> iso_broadcast_receiver: ISO Channel 0x20001260 connected
82 [00:00:11.639,343] <inf> iso_broadcast_receiver: Overall : Received 99/100 (99.00%) - Total packets lost 1
83 [00:00:11.639,343] <inf> iso_broadcast_receiver: Current Sync: Received 99/100 (99.00%) - Total packets lost 1
84 [00:00:11.639,373] <inf> iso_broadcast_receiver: Latest 1000 : Received 99/100 (99.00%) - Total packets lost 1
85 [00:00:12.029,388] <inf> iso_broadcast_receiver: Overall : Received 199/200 (99.50%) - Total packets lost 1
86 [00:00:12.029,388] <inf> iso_broadcast_receiver: Current Sync: Received 199/200 (99.50%) - Total packets lost 1
87 [00:00:12.029,388] <inf> iso_broadcast_receiver: Latest 1000 : Received 199/200 (99.50%) - Total packets lost 1
88
89
90The broadcaster will ask if any changes to the current settings are wanted.
91If y/Y is chosen, then it will create a prompt to enter changes to the settings,
92otherwise continue with the current settings. The broadcaster will then start
93the BIG and output the current counter (since the BIG was created)::
94
95 *** Booting Zephyr OS build zephyr-v2.5.0-3768-g06d4327cc601 ***
96 [00:00:00.447,845] <inf> iso_broadcast_main: Starting Bluetooth Throughput
97 Choose device role - type r (receiver role) or b (broadcaster role), or q to quit: b
98 Broadcaster role
99 Change settings (y/N)? (Current settings: rtn=2, interval=7500, latency=10, phy=2, sdu=251, packing=0, framing=0, bis_count=2)
100 [00:00:08.802,185] <inf> iso_broadcast_broadcaster: Creating Extended Advertising set
101 [00:00:08.804,260] <inf> iso_broadcast_broadcaster: Setting Extended Advertising parameters
102 [00:00:08.804,504] <inf> iso_broadcast_broadcaster: Starting Periodic Advertising
103 [00:00:08.804,870] <inf> iso_broadcast_broadcaster: Starting Extended Advertising set
104 [00:00:08.807,159] <inf> iso_broadcast_broadcaster: Creating BIG
105 [00:00:08.807,617] <inf> iso_broadcast_broadcaster: Waiting for BIG complete
106 [00:00:08.813,049] <inf> iso_broadcast_broadcaster: ISO Channel 0x20001218 connected
107 [00:00:08.813,171] <inf> iso_broadcast_broadcaster: BIG created
108 [00:00:08.813,507] <inf> iso_broadcast_broadcaster: ISO Channel 0x2000122c connected
109 [00:00:09.196,472] <inf> iso_broadcast_broadcaster: Sending value 100
110 [00:00:09.587,036] <inf> iso_broadcast_broadcaster: Sending value 200
111 [00:00:09.977,722] <inf> iso_broadcast_broadcaster: Sending value 300
112 [00:00:10.368,347] <inf> iso_broadcast_broadcaster: Sending value 400
113 [00:00:10.758,972] <inf> iso_broadcast_broadcaster: Sending value 500
114 [00:00:11.149,597] <inf> iso_broadcast_broadcaster: Sending value 600
115 [00:00:11.540,222] <inf> iso_broadcast_broadcaster: Sending value 700
116
