Lost callback messages when the function receive many simultaneous messages

[Renato Silva]

Hello!

I am developing a solution that has a gateway and about 10 devices.

The devices has some sensors and their are connected in gateway. Actually I catch the sensor values and send to gateway, this feature works fine, but when the solution runs with all devices, their sends the message in the same time and some messages are losted in the handle_cb function (gateway).

Someone can help me to resolve or improve this problem, because I wanna have a error rate < 3%.

[Einar Thorsrud]

Hi,

Can you elaborate the question? For instance, which radio protocol are you using, which SDK, more about your code etc.?

[Renato Silva]

Hi!

I am using a light switch example from SDK14.

Instead of the server send a command to turn on/off the lights, I inserted some sensors and a timer that sends the sensors values for each 10 seconds in a json object

In the client side, there is a handle_cb function that receives the messages from all servers, but when the messages arrived in the same time, some messages are losted.

I did the follow test: When I turn on the servers with a time interval (1 sec, for example), the client side receives all the information with a gap (without loss). However, when I turn on all the servers in the same time, the gateway lost some messages.

[Einar Thorsrud]

Hi,

I am still not sure which example and even which radio protocol you are referring to. Can you specify the full path to the example within the SDK? Are we talking about BLE mesh light switch example, or something else? If mesh, which version of mesh DSK are you using?

[Renato Silva]

Hi,

My solution is based in the ight switch from SDK Mesh 1.0. (BLE mesh light switch example)

[Einar Thorsrud]

Hi Renato,

OK. So the problem is in the client/gateway, which is connected to 10 light switches based on the Mesh SDK example? Can you describe in more detail what you have done and how/where you see the message being lost

As this is in your code it would also be very useful if you could upload it here, so that we can try to understand it. Particularly seeing this handle_cb function you refer to as the problem would be useful. When you debugged, how did you see that the data is lost in this function? How is it lost?

[Renato Silva]

Hi Einar,

Einar Thorsrud said:

OK. So the problem is in the client/gateway, which is connected to 10 light switches based on the Mesh SDK example?

Yes, the problem is in the client/gateway.

Einar Thorsrud said:

Can you describe in more detail what you have done and how/where you see the message being lost

My solution is based in light switch example from SDK Mesh.

Instead of the server send a command to turn on/off the lights, I inserted some sensors and a timer that sends the sensors values for each 10 seconds in a json object, using the packet_tx function present in access.c file.

In the client side, there is a handle_data_cb function, this function is a callback that receives the messages from all servers, but when the messages arrived in the same time, some messages are losted.

This is the function that receives the messages in the gateway side:

static const access_opcode_handler_t m_opcode_handlers[] =
{
{{SIMPLE_ON_OFF_OPCODE_DATA, ACCESS_COMPANY_ID_NORDIC}, handle_data_cb} //foi criado um novo handle para os dados
};

static void handle_data_cb(access_model_handle_t handle, const access_message_rx_t * p_message, void * p_args)
{
char *rec;
char src[3] = {0}, *str;
uint8_t type;

__LOG(LOG_SRC_APP, LOG_LEVEL_INFO, "[%d] Mensagem original: %s \n", ++x, p_message->p_data);

}

I did the follow test: When I turn on the servers with a time interval (5 sec, for example), the client side receives all the information with a gap (without loss). For example: I turn on the first one server and 5 sec. after I turned on the first one, I turn on the second one... 

However, when I turn on all the servers in the same time, the gateway lost some messages. I know it because I inserted in the json object a counter that show how much messages were sent from server and another counter that show how much messages were received in the gateway from each server.