RE: Advertise two services at the same time?

devops — Fri, 26 Oct 2018 05:02:40 GMT

Thank you for such a thorough response. I will try to implement the changes you described over the weekend and will update the post.

EDIT:

Your solution works very well and I have implemented it to my code. I removed the scan response packet and am now advertising two services instead. The current consumption should go down as well, right?

RE: Advertise two services at the same time?

Simon — Thu, 25 Oct 2018 13:47:11 GMT

What you are doing now is to just overwrite the old data (as you mentioned). What you need to do is the following:

#define SIG_TEMP_SERVICE_UUID 0x1815 //Official SIG temperature service
#define SIG_BAT_SERVICE_UUID 0x180F  //official SIG battery service

ble_advdata_service_data_t service_data[2] = {};

//Creating data structure for temperature
uint8_t rotation_data[] = {1, 2, 3, 4, 5};
uint8_array_t rotation;
rotation.size = sizeof(rotation_data);
rotation.p_data = rotation_data;

// Adding temperature "service" to service_data array
service_data[0].service_uuid = SIG_TEMP_SERVICE_UUID; 
service_data[0].data = rotation;


//Creating data structure for battery
uint8_t battery_data[] = {6, 7, 8, 9, 10};
uint8_array_t battery;
battery.size = sizeof(battery_data);
battery.p_data = battery_data;

// Adding temperature "service" to service_data array
service_data[1].service_uuid = SIG_BAT_SERVICE_UUID; 
service_data[1].data = battery;

init.advdata.service_data_count = 2;
init.advdata.p_service_data_array = service_data;

The changes I made from your code was roughly:

Created an array of type ble_advdata_service_data_t and assigned the temperature info to field 0 and the battery info to field 1
Set the field init.advdata.service_count to 2
Excluded the & sign when assigning service_data to the init structure, since the variable is turned in to pointer when declared as array

The reason for these changes can be found in the function advertising_init()->ble_advdata_encode(..)->service_data_encode(..)

service_data_encode(..){
.
.
for (i = 0; i < p_advdata->service_data_count; i++)
{
    ble_advdata_service_data_t * p_service_data;
    uint32_t                     data_size;

    p_service_data = &p_advdata->p_service_data_array[i];
.
.

As you can see, it will only encode as may GAP data types of "Service Data" as specified by service_data_count.

Best regards, Simon

RE: Advertise two services at the same time?

Simon — Wed, 24 Oct 2018 16:09:04 GMT

I will try to provide you with an answer by tomorrow.