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NCS: connection interval changing to CONFIG_BT_PERIPHERAL_PREF_MAX_INT after 5s

Nicolas Brunner

I'm using NCS 1.4.0 and 2 boards nRF5340PDK.

I'm using central_uart and peripheral_uart samples. Both display when connection interval change.

The central_uart use BT_LE_CONN_PARAM(6, 12, 0, 400). The peripheral_uart use default value that are:

#define CONFIG_BT_PERIPHERAL_PREF_MIN_INT 24
#define CONFIG_BT_PERIPHERAL_PREF_MAX_INT 40

When I test the samples, the connection interval is first correctly set at 12 but after 5s it change to 40. Here are the logs:

Fullscreen 7127.peripheral_uart.txt Download 
[00:00:00.419,616] <inf> fs_nvs: 2 Sectors of 4096 bytes
[00:00:00.419,616] <inf> fs_nvs: alloc wra: 0, fa8
[00:00:00.419,616] <inf> fs_nvs: data wra: 0, a4
[00:00:00.435,913] <wrn> bt_hci_core: ECC HCI commands not available
[00:00:00.435,913] <inf> bt_hci_core: No ID address. App must call settings_load()
[00:00:00.435,913] <inf> peripheral_uart: Bluetooth initialized
[00:00:02.537,567] <inf> peripheral_uart: Connected ea:b6:af:d6:f9:b3 (random)
[00:00:02.537,597] <inf> peripheral_uart: Connection interval: 12
[00:00:02.644,195] <inf> peripheral_uart: Security changed: ea:b6:af:d6:f9:b3 (random) level 2
[00:00:07.863,861] <inf> peripheral_uart: Connection interval: 40
Fullscreen 5074.central_uart.txt Download 
[00:00:00.373,046] <inf> fs_nvs: 2 Sectors of 4096 bytes
[00:00:00.373,046] <inf> fs_nvs: alloc wra: 0, fc0
[00:00:00.373,046] <inf> fs_nvs: data wra: 0, 88
[00:00:00.389,709] <wrn> bt_hci_core: ECC HCI commands not available
[00:00:00.389,739] <inf> bt_hci_core: No ID address. App must call settings_load()
[00:00:00.389,739] <inf> central_uart: Bluetooth initialized
[00:00:00.392,120] <inf> central_uart: Scan module initialized
[00:00:00.392,120] <inf> central_uart: NUS Client module initialized
[00:00:00.398,925] <inf> central_uart: Scanning successfully started
[00:00:00.465,423] <inf> central_uart: Filters matched. Address: e6:a7:8c:4b:48:5c (random) connectable: 0
[00:00:00.566,070] <inf> central_uart: Connected: e6:a7:8c:4b:48:5c (random)
[00:00:00.566,070] <inf> central_uart: Connection interval: 12
[00:00:00.672,668] <inf> central_uart: Security changed: e6:a7:8c:4b:48:5c (random) level 2
[00:00:00.957,519] <inf> central_uart: Service discovery completed
[00:00:05.892,486] <inf> central_uart: Connection interval: 40

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