ESP32-C6 BLE bonding lost after reconnect (iOS, AT v4.1.1.0)

[oumayma-ba]

Hi,

I am using the following ESP-AT firmware:
ESP32-C6-4MB-AT-V4.1.1.0

Setup:

Custom GATT profile
Pairing with bonding enabled
Issue

Bonding is not persistent. After connecting and disconnecting multiple times, the pairing is lost and reconnection fails.

On iPhone, I get:

"peer removed pairing information"

ESP32 logs:
I (2917514) at-ble: our_id_addr_type=0 our_id_addr=8a:19:0c:bd:f5:f0
I (2917520) at-ble: peer_ota_addr_type=1 peer_ota_addr=30:d0:dd:02:60:5c
I (2917527) at-ble: peer_id_addr_type=1 peer_id_addr=30:d0:dd:02:60:5c
I (2917533) at-ble: conn_itvl=24 conn_latency=0 supervision_timeout=72 encrypted=0 authenticated=0 bonded=0
W (2917962) at-ble: disconnect, reason=531

Device is not recognized as bonded (bonded=0)
Happens after several reconnect cycles
Question

Is this the same issue as:
#859 (bonding lost with iOS devices)

And if yes:
👉 Is the fix included in v4.1.1.0, or only in master?

[XionHsieh1025]

Hi @oumayma-ba

This issue has been fixed in the master branch, but the fix has not been backported to the existing C6 release branch yet.
It will be included in the next release version, which is v4.2.

[oumayma-ba]

Hi @XionHsieh1025,

Thank you.

Do you have an estimated timeline for the release of v4.2?

In the meantime, I would like to use the fix.
Would it be possible to:

• Know the exact commit (or range) where this issue was fixed?
• or confirm if building ESP-AT from the current master branch is the recommended approach for ESP32-C6?

Also, is there any specific configuration required when building from master to ensure the fix is properly included?

Thanks.

[XionHsieh1025]

Hi @oumayma-ba

The v4.2 release is scheduled for the end of May.

The exact commit that fixes this issue is:

74a92ff

Building ESP-AT for ESP32-C6 from the current master branch is the recommended approach. No extra specific configuration is required; the default build configuration will properly include this fix.

[oumayma-ba]

Thank you