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  • Case ID: 316596
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nrf5340 audio:LE audio Stream stopped.INSUFFICIENT_RESOURCES

Reskyllr

We have an nrf5340 audio application, and there were no problems with the previous development.
But when I want to extend the CIS function, especially when enabling bidirectional transmission, an error occurs, but I cannot determine the reason.
00> HL [00:11:23.514,648] <inf> cis_gateway: Stream 0x20003744 stopped. Reason 13
00> HL [00:11:23.514,648] <wrn> cis_gateway: Unknown stream
00> HL [00:11:23.514,678] <inf> cis_gateway: Stream 0x20003524 stopped. Reason 13
00> HL [00:11:23.515,625] <wrn> cis_gateway: Unknown stream

Reason 13 is BT_HCI_ERR_INSUFFICIENT_RESOURCES.
What causes this error? If bidirectional transmission is not started, it works normally.
What I want to know most is what causes this error.

Thanks,

Reskyllr

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  • 0

    Hi,

    Support for bidirectional streams to or from 2 headsets was added in NCS v2.3.0. Have you selected CONFIG_STREAM_BIDIRECTIONAL=y in your project configuration?

    Could you please provide information on what you try to achieve?

    Best regards,
    Dejan

  • 0 in reply to dejans

    Hi dejans,

    Yes, I added CONFIG_STREAM_BIDIRECTIONAL=y, I want to use CIS intercom functionality, but that's not my main goal.
    I want to know what causes BT_HCI_ERR_INSUFFICIENT_RESOURCES.
    Because there is another situation where the same error occurs:
    I expanded the SDU size to 240 (used to transmit stereo sound) in BIS mode, and everything worked fine.
    When I want to do the same work in CIS mode, Stream stop: Reason 13(BT_HCI_ERR_INSUFFICIENT_RESOURCES) appears.
    If you restore the SDU size to 120 (mono transmission), it works normally.
    But when adding CONFIG_STREAM_BIDIRECTIONAL=y, the same error (BT_HCI_ERR_INSUFFICIENT_RESOURCES) occurred again.

    You don't need to understand it, I just want to know the cause of this error and how to fix it.
    Thanks,
    Reskyllr

  • 0 in reply to dejans

    Hi,dejans

    I understand your statement.
    In addition to SDU, it seems to be related to CONFIG_BT_AUDIO_RETRANSMITS.
    When CIS SDU = 120, CONFIG_BT_AUDIO_RETRANSMITS=2, it works normally. CONFIG_BT_AUDIO_RETRANSMITS=4, BT_HCI_ERR_INSUFFICIENT_RESOURCES appears.
    What is the conversion relationship between them? Do you mean that the two-way SDU needs to be limited to less than 80? Does it mean that the total SDU cannot exceed 160?

  • 0 in reply to dejans

    When I tried to change the bitrate from 96000 -> 48000 (SDU 120 -> 60), there was a problem of direct disconnection after connection. The log is as follows. I just changed the 4 parameters (CONFIG_LC3_BITRATE, CONFIG_BT_AUDIO_BITRATE_UNICAST_SINK, CONFIG_BT_AUDIO_BITRATE_UNICAST_SRC, CONFIG_BT_AUDIO_BITRATE_ BROADCAST_SRC) from 96000 is modified to 48000
    The log is as follows:

    00> HL [00:00:02.862,548] <dbg> cis_gateway: le_audio_play_pause_cb: Play/pause cb, state: 1
00> HL [00:00:02.862,548] <dbg> cis_gateway: ep_state_check: Endpoint is NULL
00> HL [00:00:02.862,548] <dbg> cis_gateway: ep_state_check: Endpoint is NULL
00> HL [00:03:10.986,694] <inf> cis_gateway: [BLE] start_scan
00> HL [00:03:10.986,694] <inf> cis_gateway: Scanning successfully started
00> HL [00:03:11.055,389] <inf> cis_gateway: Device found FSC-BT631D-LE-76DC
00> HL [00:03:11.086,242] <inf> cis_gateway: Connected: 5F:55:C7:4F:47:64 (random)
00> HL [00:03:11.086,669] <dbg> cis_gateway: connected_cb: TX power set to 0 dBm for connection 0x20004990
00> HL [00:03:11.696,350] <dbg> cis_gateway: security_changed_cb: Security changed: level 2
00> HL [00:03:12.334,136] <inf> cis_gateway: [BLE] start_scan
00> HL [00:03:12.334,838] <inf> cis_gateway: Scanning successfully started
00> HL [00:03:12.774,322] <dbg> cis_gateway: available_contexts_cb: conn: 5F:55:C7:4F:47:64 (random), snk ctx 5 src ctx 0
00> 
00> HL [00:03:13.414,184] <dbg> cis_gateway: discover_sink_cb: Sink discover complete: err 0
00> HL [00:03:13.414,215] <dbg> bt_bap_stream: bt_bap_stream_config: conn 0x20004990 stream 0x20002edc, ep 0x20030814 codec 0x200007a8 codec id 0x06 codec cid 0x0000 codec vid 0x0000
00> HL [00:03:13.414,245] <dbg> bt_bap_stream: bt_bap_stream_attach: conn 0x20004990 stream 0x20002edc ep 0x20030814 codec 0x200007a8
00> HL [00:03:13.495,605] <inf> cis_gateway: LEFT sink stream configured
00> HL [00:03:13.495,605] <dbg> cis_gateway: stream_configured_cb: Set LEFT headset, connection 0x2000331c, stream 0x20002edc
00> HL [00:03:13.495,635] <dbg> bt_bap_stream: bt_bap_stream_qos: conn 0x20004990 group 0x20030b94
00> HL [00:03:13.495,635] <dbg> bt_bap_stream: bt_bap_stream_verify_qos: Latency 20 higher than preferred max 10
00> HL [00:03:13.574,310] <inf> cis_gateway: Set LEFT to PD: 10000
00> HL [00:03:13.574,310] <dbg> bt_bap_stream: bt_bap_stream_enable: stream 0x20002edc
00> HL [00:03:13.574,371] <inf> cis_gateway: Enable stream 0x20002edc
00> HL [00:03:13.614,593] <dbg> cis_gateway: stream_enabled_cb: Stream enabled: 0x20002edc
00> HL [00:03:13.614,624] <dbg> cis_gateway: stream_enabled_cb: k_msg_put: ch: 0, dir: 1, retries 0
00> HL [00:03:13.614,898] <dbg> cis_gateway: work_stream_start: k_msg_get: ch: 0, dir: 1, retries 0
00> HL [00:03:13.614,898] <dbg> bt_bap_stream: bt_bap_stream_start: stream 0x20002edc ep 0x20030814
00> HL [00:03:13.899,902] <inf> bt_iso: hci_le_cis_established
00> HL [00:03:13.899,932] <dbg> bt_iso: hci_le_cis_established: status 0 handle 2
00> HL [00:03:13.899,932] <dbg> bt_iso: hci_le_cis_established: iso_chan 0x2003040c tx 0x2003047c rx 0x20030444
00> HL [00:03:13.899,963] <dbg> bt_iso: bt_iso_connected: 0x20004f00
00> HL [00:03:14.890,075] <dbg> bt_iso: bt_iso_disconnected: 0x20004f00
00> HL [00:03:14.890,075] <dbg> bt_iso: bt_iso_chan_disconnected: 0x2003040c, reason 0x13
00> HL [00:03:14.890,075] <dbg> bt_iso: bt_iso_cleanup_acl: 0x20004f00
00> HL [00:03:14.890,136] <dbg> bt_iso: bt_iso_remove_data_path: 0x20004f00
00> HL [00:03:14.890,441] <wrn> bt_hci_core: opcode 0x206f status 0x0c
00> HL [00:03:14.890,930] <wrn> bt_hci_core: opcode 0x206f status 0x12
00> HL [00:03:14.890,930] <inf> cis_gateway: Stream 0x20002edc stopped. Reason 19
00> HL [00:03:14.890,960] <dbg> cis_gateway: ep_state_check: Endpoint is NULL
00> HL [00:03:14.891,235] <inf> streamctrl: LE audio evt not_streaming
00> HL [00:03:14.893,127] <dbg> bt_bap_stream: bt_bap_stream_reset: stream 0x20002edc
00> HL [00:03:14.893,127] <dbg> bt_bap_stream: bt_bap_stream_detach: stream 0x20002edc
00> HL [00:03:14.893,157] <dbg> bt_bap_stream: bt_bap_stream_disconnect: stream 0x20002edc iso (nil)
00> HL [00:03:14.893,157] <dbg> cis_gateway: stream_released_cb: Audio Stream 0x20002edc released
00> HL [00:03:14.893,157] <dbg> cis_gateway: ep_state_check: Endpoint is NULL
00> HL [00:03:14.893,371] <inf> cis_gateway: Disconnected: 5F:55:C7:4F:47:64 (random) (reason 0x08)
00> HL [00:03:14.893,432] <inf> cis_gateway: [BLE] start_scan
00> HL [00:03:14.893,463] <inf> cis_gateway: Scanning successfully started
00> HL [00:03:14.893,951] <inf> streamctrl: LE audio evt not_streaming
00> HL [00:03:14.907,257] <inf> cis_gateway: Device found FSC-BT631D-LE-76DC

    Any advice to offer?

    Thanks,

    Reskyllr

  • 0 in reply to dejans

    Report new progress:
    When the bitrate is 64000 (SDU 80) it works fine, why is this? Can I set it to 60 and still have it work?

  • 0 in reply to Reskyllr

    Hi,

    Bitrates are set using CONFIG_BT_AUDIO_BITRATE_UNICAST_SINK and CONFIG_BT_AUDIO_BITRATE_UNICAST_SRC. Default values can be found in <your_project_folder>\src\bluetooth\Kconfig.

    Best regards,
    Dejan

  • 0 in reply to dejans

    I know very well how to modify the bitrate, but when modified to 48000, it doesn't work, and when it is 64000, it works.

    Thanks,

    Reskyllr

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