ADV DATA PARSER

[gdutk001]

Hello, i am using NRF52840 board with SDK 15.2. I am trying to read data from an advertising packet and i was just wondering if anybody on here had a good parser i could potentially use to parse scan response data for softdevice 140 version 6.1.

 - thank you

[Nguyen Hoan Hoang]

Look in the Central examples of the SDK. The SDK 15.2 has added library code for scan parsing, look it up in components/ble 

[ovrebekk]

Hi 

I found the following code snippet in one of the examples:

/**
* @brief Parses advertisement data, providing length and location of the field in case
* matching data is found.
*
* @param[in] type Type of data to be looked for in advertisement data.
* @param[in] p_advdata Advertisement report length and pointer to report.
* @param[out] p_typedata If data type requested is found in the data report, type data length and
* pointer to data will be populated here.
*
* @retval NRF_SUCCESS if the data type is found in the report.
* @retval NRF_ERROR_NOT_FOUND if the data type could not be found.
*/
static uint32_t adv_report_parse(uint8_t type, uint8_array_t * p_advdata, uint8_array_t * p_typedata)
{
uint32_t index = 0;
uint8_t * p_data;

p_data = p_advdata->p_data;

while (index < p_advdata->size)
{
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->size = field_length - 1;
return NRF_SUCCESS;
}
index += field_length + 1;
}
return NRF_ERROR_NOT_FOUND;
}

Basically you use it together with the various BLE_GAP_AD_TYPE_... defines to look for specific advertising fields in the advertising report, and if the field is found the function will return NRF_SUCCESS and store the data in the array pointed to by the last argument. 

Best regards
Torbjørn