My project assuming coexist BLE-MESH and BLE in parallel. I need to send some amount of data (about 2-4Kb) thru BLE. So i hit problem unable to change MTU size.
esp_ble_gatt_set_local_mtu(517) returns ESP_OK
When connecting there are message:
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ESP_GATTS_MTU_EVT, MTU 23
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Requested MTU not supported. MTU changed to: 23