Public bug reported:
In an industrial IoT context (Volvo Group), we are using TE Connectivity
M5600 BLE pressure sensors. These sensors have a high response latency
during the initial connection handshake.
Problem:
The current hardcoded timeout in net/bluetooth/hci_conn.c is set to 2 seconds
(msecs_to_jiffies(2000)). This is too short for these specific sensors, causing
systematic connection failures on Ubuntu Core 22 (Raspberry Pi 4).
Proposed Solution:
I have successfully tested a custom kernel build where the timeout is increased
to 20 seconds.
Attached Patch:
Please find attached the patch modifying hci_connect_le and hci_connect_le_scan
in net/bluetooth/hci_conn.c.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: bluetooth iot kernel-bug raspberrypi raspi
** Patch added: "Kernel patch to increase BLE connection timeout in hci_conn.c"
https://bugs.launchpad.net/bugs/2142623/+attachment/5948427/+files/ble_timeout_fix.patch
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https://bugs.launchpad.net/bugs/2142623
Title:
[Kernel] Bluetooth LE connection timeout too short for industrial Te
connectivity sensors
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