Appkey always equals 0 in my custom model in BT mesh

[lalum]

Hello everyone,

I'm currently trying to create Bluetooth mesh custom client and server with the nrf connect sdk. 

The purpose of my application is to make my server send data automatically to my client when it receives a particular message from it.

A very common type of communication between a server and a client !

To send a message to my server, my client use the model publication context configurated by the Configuration Client Model. (so I use publish function)
To send a message to my client, my server use the publication context of my client request to respond to the client. (So I use send function)

My problem is that my server failed to respond to my client because the Appkey that it receives from my client always equals zero, and it doesn't recognize it. I have this error :

"E : Model don't bound to AppKey 0x000"

After this error, my server is no longer able to receive messages from my client.

I use the phone app nrf mesh to provision my node and to provide an AppKey to my Client and my Server.

If you have any idea about what can cause this problem it would be very helpful !

[AHaug]

Hi,

I've picked up your case and I will be looking into answering your issue. However response time might be a bit longer due to the summer vacation period here in Norway. I will get back to you as soon as I know more, hopefully within the weekend.

Kind regards,
Andreas

[AHaug]

Hi,

Could you supply me with some more info about the following: 

1. Can you verify if you are working with nRF Connect SDK and if so what version are you using?
2. Is "E : Model don't bound to AppKey 0x000" the exact error message you are receiving or is it translated to English? 
3. You state you're using the nRF Mesh application to provision your node. Can you state which phone OS you are using (and what version of the mobile application)?
4. Did you base your custom application on any existing samples? If so, could you supply them to me?

Kind regards,
Andreas

[lalum]

Hi,

thanks for your reply ! For a strange reason it works now ... I don't succeed to identify the source of the problem... And I don't really like it because I didn't do something in particular and I'm afraid that the problem will reappear.

So I give you the answers just in case :

1. I work with nRF connect sdk on visual studio code, v1.9.1 release
2. Yes it was the exact error message that I received when I connected my nrf52840 in serial and I started communication

3. I use nrf Mesh 3.2.4 on an Androïd phone
4. I base my custom application on several examples such as the generic OnOff models in the nrf sdk and the chat sample

kind regards

[AHaug]

Hi,

lalum said:

For a strange reason it works now ... I don't succeed to identify the source of the problem...

I'm glad to hear that the issue has fixed itself automagically! 

I'll let the case stay open in case you manage to reproduce the issue and we need to look closer into it again

Kind regards,
Andreas

[lalum]

Hi Andreas,

my problem reappeared. I think my problem is that I don't really understand how the Appkeys are bound to models...

This time my server receive the message from my client and when it wants to respond I have this error : "E : Model not bound to Appkey 0x2000".

So to give you more information, this is my function which handle the message sent by the client: (my client send a request to my server with an offset and a size to read datas in a particular area of the RAM)

static int bt_mesh_handle_message_request(struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx, struct net_buf_simple *buf){
    printk("SERVER : receive request message \n");
	uint32_t receive_offset = net_buf_simple_pull_le32(buf);
	size_t receive_size = net_buf_simple_pull_le32(buf);
	printk("SERVER : receive offset = %d and size = %zu \n", receive_offset, receive_size);

	struct bt_mesh_datas_state datas_state_srv = {
		.address = SHARED_RAM_ADDRESS + receive_offset,
		.datas = (uint32_t *) datas_state_srv.address,
		.remaining_datas = receive_size 
	};

	struct k_thread my_thread_data;
	printk("DEBUG : create thread \n");
	k_thread_create(&my_thread_data, &my_thread_stack, STACKSIZE, My_thread, model, ctx, &datas_state_srv, PRIORITY, 0, K_NO_WAIT);
	return 0;
}

This handler create a thread that I want to use to split the data into packets and send them. But to begin, I just want to send at least on packet in this thread to test, so the thread looks like this :

void My_thread(struct bt_mesh_model *model, struct bt_mesh_msg_ctx *rx_ctx, struct bt_mesh_datas_state *datas_state_srv){
	
	printk("DEBUG : In the thread \n");
	BT_MESH_MODEL_BUF_DEFINE(msg, BT_MESH_MESH_OP_DATAS, 1);
	bt_mesh_model_msg_init(&msg, BT_MESH_MESH_OP_DATAS);

	net_buf_simple_add(&msg, 5);
	(void) bt_mesh_model_send(model, rx_ctx, &msg, NULL, NULL);
	printk("DEBUG : send message ok \n");

	while(1){

		printk("DEBUG : thread finished \n");
		k_usleep(100000000000);
	}	
	return;
}

when I try to debug, I see that the rx_ctx-> app_idx = 0x2000 and model->key is empty ... But I don't understand why model->key is empty because I bound an Appkey to my server and client models in the nRF mesh app...

Sorry I'm very new with zephyr, nordic and BT mesh and I try to understand !

Kind regards