BLE Mesh Model for user data transfer

RE: BLE Mesh Model for user data transfer

Hung Bui — Fri, 09 Apr 2021 14:04:52 GMT

Hi Selvam,

The particular chat example use the SHELL module to handle UART communication to allow chat experience.
If you want to send your own data without any UART you would need to have a look at the model_hanlder.c and see how the message is send and received.
For example calling function cmd_message() will send a message on the chat client (bt_mesh_chat_cli_message_send() )

When there is a message arrived, the handle_message() function in chat_cli.c will call chat->handlers->message(chat, ctx, msg) which is the handle_chat_message() function in model_handler.c to print out the message.

Note that this is just an example, you can just use this chat_cli.c model as a refering source and build your own client or server. Please follow the guide here.

RE: BLE Mesh Model for user data transfer

selvam — Thu, 08 Apr 2021 14:22:25 GMT

No problem Hung Bui,

Hope you enjoyed the Easter Vacation.

BTW, By configuring "CONFIG_BT_TINYCRYPT_ECC=y" able to do communication between nRF5340 DK boards through UART shell.

It looks like TX and RX thread of Zephyr expecting the data from Shell and then do the BLE data handle.

But the need is to transfer the own data between two nRF5340 boards without shell typing.

Please guide us to transfer the data without using shell.

Thanks

Selvam

RE: BLE Mesh Model for user data transfer

Hung Bui — Tue, 06 Apr 2021 09:52:38 GMT

Hi Selvam,

Sorry for late response. We had Easter vacation last week.

The log showed that there was an issue with the HCI interface. Could be an issue with the image on the netcore. Please made sure that it's the Zephyr controller used, not the Nordic's one. It's described here.

Have you managed to run other mesh examples ? For example the light_switch sample?

RE: BLE Mesh Model for user data transfer

selvam — Sat, 27 Mar 2021 15:26:09 GMT

Hi Hung Bui,

While loading the sample chat as below steps,

1. Connect nRF5340 DK and Load merged_CPUNET.hex through "nRF connect Programmer"

Close device in ""nRF connect Programmer"

2. In "Segger Embedded Studio", Connect J link and Click "Build and Debug" option.

we are getting the below fail message in putty and there is no device name in "nRF mesh" mobile app

uart:~$ I: HW Platform: Nordic Semiconductor (0x0002)
I: HW Variant: nRF53x (0x0003)
I: Firmware: Standard Bluetooth controller (0x00) Version 229.40135 Build 486576601
I: No ID address. App must call settings_load()
Bluetooth initialized
>>> Bluetooth Mesh Chat sample <<<
uart:~$ W: ECC HCI commands not available
E: Failed to generate public key (-35)
Initializing mesh failed (err -35)

Please guide , is any steps we missed ?

It will helpful to proceed.

Thanks in Advance.

Thanks

Selvam

RE: BLE Mesh Model for user data transfer

selvam — Fri, 26 Mar 2021 17:29:34 GMT

Hi Hung Bui,

Thanks for the inputs on selecting BLE mesh model.

We will refer the given example and follow the testing procedure as per in the link Bluetooth: Mesh chat — nRF Connect SDK 1.5.0 documentation (nordicsemi.com)..

We will revert back once we tried .

Thanks

Selvam

RE: BLE Mesh Model for user data transfer

Hung Bui — Fri, 26 Mar 2021 13:12:09 GMT

Hi Selvam,

If you are planning to transmit customized data, I would suggest to create your own model instead of using the Generic on/off model. The generic model from Bluetooth SIG is defined in the spec and can't be modified as your need.
Note that when you define your own model, you need to follow the spec and tie your model to your company ID. Please check the bluetooth mesh spec on this.
An example that you can have a look is the \nrf\samples\bluetooth\mesh\chat in the NCS SDK v1.5.0.

In the example we defined a vendor specific model for sending chat message between nodes. In the implementation we use chat clients on all node, but if you want client-server communication, you can also define your server model based on how we define the client.