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Following is a collection of questions received during the Q&A session we were unable to answer in real time due to time constrains.
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Q&A PART3. (Q&A PART 1 ; Q&A PART2)
[Q] Does CE certification is needed for an end device using STM32WB5MMG inside?
[A] Yes, the CE certification must be always done for the end-product itself, but the module will help to cover the RF certification.
[Q] Is it possible to increase the radio output power from 6dbm?
[A] The power can be increased above 6dBm with external Power amplifier. See application note AN5395 - External power amplifier
[Q] UM2804 about HAL API for BLE describes how to use LLD and HAL. Is the source code for that APIs available?
[A] Source code for the HAL can be found in STM32CubeWB at this path: “Middlewares/ST/STM32_WPAN/ble_lld/hal/ble_hal.c�?
[Q] A distributed Bluetooth LE mesh topology requires more power consumption vs standard point to point or standard network?
[A] Battery powered sensors are typically assigned to low power nodes and can operate many years with coin cell while BLE Mesh flooding is managed by relay nodes only. Low Power Nodes polls periodically to Friends node to enable power saving features.
[Q] LPUART Examples for STM32WB5MM-DK is not available, when can we expect it?
[A] For the STM32WB5MM-DK, we don't have full set of examples for all the peripherals. The device inside the module is STM32WB55VG, so it is possible to reuse the examples available for NUCLEO-WB55RG (just slight modifications will be needed to adapt to the pins used on the DK). Don't hesitate to contact us on OLS in case you have further issues or questions related to the subject.
[Q] ST is planning in the future to have other modules like STM32WB5MMG but tailored for Bluetooth LE for example with the STM32WB15?
[A] There is a plan to have module based on STM32WB15.
[Q] How security managed in mesh network?
[A] In BLE Mesh secure keys are provisioned into device during provisioning process. There is network wide key shared among all nodes just for relaying the network packet and also second level of encryption with application keys that are provisioned only into a subset of nodes that share the common functionality. For overview I suggest having a look on following document https://www.bluetooth.com/bluetooth-resources/bluetooth-mesh-networking-an-introduction-for-developers/
[Q] can I send a long data payload on BLE mesh, e.g. 128 bytes long, e.g. audio packets?
[A] BLE Mesh is advertising bearer is using small advertising packets 31 bytes, but the payloads at Transport level is only 11 bytes. Although segmented messages are also possible, the throughput of BLE Mesh is not enough for real time audio.
[Q] Is Azure RTOS will be available for STM32WB5MMG ?
[A] Yes, Azure integration on STM32WB is planned on 21W47.
[Q] Where can I find a quick start guide, that can help me for PCB?
[A] Have a look at AN5165 Development of RF hardware using STM32WB microcontrollers and AN3359 antenna design
