How to get manufacturer's data from a received advertising message?

Question

In my application, I'm setting a message as manufacturer's data to be sent with the advertising message. To do that is simple, since I have a data type ble_advdata_t , and I can set a pointer to an object of type ble_advdata_manuf_data_t . 
 But when I receive a advertising event, the type I get is ble_gap_evt_adv_report_t . This type has a field data[31], where the manufacturer's data is included, but also a bunch of other data sent with the advertising. 
 I'm looking for a way to get just the manufacture's data. Maybe a "parser" to a variable of type ble_advdata_t . 
 I have tried to use the function ble_advdata_set , passing the first argument as NULL and the second as a pointer to a variable of type ble_advdata_t , like this: 
 ble_advdata_set(NULL, &advdata)
 
 since in the documentation it says that it is a function for encoding and setting the advertising data and/or scan response data. Setting the first argument to NULL would just scan response data. But this doesn't seem to work. 
 Do anybody know what can I do? 
 Thanks in advance.

Anders Strand · Accepted Answer

See the scanning part of the BLE central tutorial 
 Use this function: 
 static uint32_t adv_report_parse(uint8_t type, data_t * p_advdata, data_t * p_typedata)

{
 uint32_t index = 0;
 uint8_t * p_data;

 p_data = p_advdata->p_data;

 while (index < p_advdata->data_len)
 {
 uint8_t field_length = p_data[index];
 uint8_t field_type = p_data[index+1];

 if (field_type == type)
 {
 p_typedata->p_data = &p_data[index+2];
 p_typedata->data_len = field_length-1;
 return NRF_SUCCESS;
 }
 index += field_length+1;
 }
 return NRF_ERROR_NOT_FOUND;
}
 
 Call it with type = BLE_GAP_AD_TYPE_MANUFACTURER_SPECIFIC_DATA (0xFF)

How to get manufacturer's data from a received advertising message?

Top Replies