Restore GAP device name after GATT reset#426
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📝 WalkthroughWalkthroughArr, this here change makes ChangesGATT Reset GAP Value Preservation
Estimated code review effort: 1 (Trivial) | ~5 minutes Poem
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Inline comments:
In `@src/NimBLEServer.cpp`:
- Around line 894-896: The static members NimBLEDevice::m_deviceName and
NimBLEDevice::m_deviceNameSet are accessed without synchronization in the
resetGATT() method, creating a potential race condition if another thread calls
setDeviceName() concurrently. To fix this, add a static mutex member (like
m_deviceNameMutex) to the NimBLEDevice class, then protect all accesses to
m_deviceName and m_deviceNameSet with std::lock_guard in both the
setDeviceName() method and the resetGATT() method. In resetGATT(), acquire the
lock, cache the values of m_deviceNameSet and m_deviceName into local variables,
release the lock, then perform the conditional call to setDeviceName() with the
cached name outside the critical section.
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src/NimBLEDevice.cppsrc/NimBLEDevice.hsrc/NimBLEServer.cpp
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Looks like espressif changed the behavior of this :( I think a better solution is to save the values in Personally I don't use espressifs fork anymore for this reason. |
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If your confusion was my remark about the espressif fork, I use this instead: https://github.com/h2zero/esp-nimble-component Updated to mynewt/nimble 1.9, doesn't have much of the espressif changes and is more stable. |
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Ok if I fix it with the espressif version? Should we detect which stack and
only apply it for espressif version?
…On Wed, Jun 24, 2026 at 4:56 PM Ryan Powell ***@***.***> wrote:
*h2zero* left a comment (h2zero/esp-nimble-cpp#426)
<#426 (comment)>
@finger563 <https://github.com/finger563>
If your confusion was my remark about the espressif fork, I use this
instead: https://github.com/h2zero/esp-nimble-component
Updated to mynewt/nimble 1.9, doesn't have much of the espressif changes
and is more stable.
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Sure, we can use this flag: |
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Has that been updated or does it work for esp idf v6? |
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It's a bit of work in progress still, haven't checked it against IDF v6. The same code is being used in nimble-arduino as well so it will be well tested. |
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@finger563, updated now, idf 5 and 6 working. |
are you using that mynewt version with esp-idf or another platform? I figured there were a ton of porting changes present to support the particular ble devices so it seemed overwhelming to consider going that route. |
ESP-IDF NimBLE can reset the GAP Device Name when the standard GAP service is reinitialized during GATT server startup. NimBLEDevice::init(deviceName) calls NimBLEDevice::setDeviceName(deviceName), but that happens before the server is started. Later, starting advertising starts the server and resets/re-registers the GAP service, causing the C GAP name backing storage to be rebuilt from CONFIG_BT_NIMBLE_SVC_GAP_DEVICE_NAME. In projects where that Kconfig default remains "nimble", the advertised Local Name can be correct while the Generic Access Device Name characteristic reports "nimble".
The failing sequence is:
-> pAdvertising->start()
-> NimBLEAdvertising::start()
-> NimBLEDevice::getServer()->start()
-> NimBLEServer::resetGATT()
-> ble_gatts_reset()
-> ble_svc_gap_init()
-> ESP-IDF NimBLE resets GAP name to CONFIG_BT_NIMBLE_SVC_GAP_DEVICE_NAME
-> "nimble"
-> ble_svc_gatt_init()
Fix this by saving the device name supplied through NimBLEDevice::setDeviceName() and reapplying it immediately after ble_svc_gap_init() in NimBLEServer::resetGATT(). This preserves the C++ wrapper contract that the configured device name remains effective even when the wrapper internally resets the GATT/GAP service tables.
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It's working with IDF, took a bit of work for sure but no too bad |
3 participants
NOTE: Codex 5.5 created this patch and writeup etc but I reviewed it and it looks like what I would have done by hand, and tested it here and it does resolve the issue and explains why I've been seeing my device misnamed for a bit. Not sure how or when I broke it, or if the issue was library side or a nimble change but figured others might be hitting this issue.
ESP-IDF NimBLE can reset the GAP Device Name when the standard GAP service is reinitialized during GATT server startup. NimBLEDevice::init(deviceName) calls NimBLEDevice::setDeviceName(deviceName), but that happens before the server is started. Later, starting advertising starts the server and resets/re-registers the GAP service, causing the C GAP name backing storage to be rebuilt from CONFIG_BT_NIMBLE_SVC_GAP_DEVICE_NAME. In projects where that Kconfig default remains "nimble", the advertised Local Name can be correct while the Generic Access Device Name characteristic reports "nimble".
The failing sequence is:
-> pAdvertising->start()
-> NimBLEAdvertising::start()
-> NimBLEDevice::getServer()->start()
-> NimBLEServer::resetGATT()
-> ble_gatts_reset()
-> ble_svc_gap_init()
-> ESP-IDF NimBLE resets GAP name to CONFIG_BT_NIMBLE_SVC_GAP_DEVICE_NAME
-> "nimble"
-> ble_svc_gatt_init()
Fix this by saving the device name supplied through NimBLEDevice::setDeviceName() and reapplying it immediately after ble_svc_gap_init() in NimBLEServer::resetGATT(). This preserves the C++ wrapper contract that the configured device name remains effective even when the wrapper internally resets the GATT/GAP service tables.
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