esp-idf/examples/bluetooth/ble_eddystone/main/esp_eddystone_api.h

/*
   This example code is in the Public Domain (or CC0 licensed, at your option.)

   Unless required by applicable law or agreed to in writing, this
   software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
   CONDITIONS OF ANY KIND, either express or implied.
*/


#ifndef __ESP_EDDYSTONE_API_H__
#define __ESP_EDDYSTONE_API_H__

typedef struct {
    struct {
        uint8_t   flags;          /*<! AD flags data */
        uint16_t  srv_uuid;       /*<! complete list of 16-bit service uuid*/
        uint16_t  srv_data_type;  /*<! service data type */
        uint8_t   frame_type;     /*<! Eddystone UID, URL or TLM */
    } common;
    union {
        struct {
            /*<! Eddystone-UID */
            int8_t  ranging_data;     /*<! calibrated Tx power at 0m */
            uint8_t namespace_id[10];
            uint8_t instance_id[6];
        } uid;
        struct {
            /*<! Eddystone-URL */
            int8_t  tx_power;                    /*<! calibrated Tx power at 0m */
            char    url[EDDYSTONE_URL_MAX_LEN];  /*<! the decoded URL */
        } url;
        struct {
            /*<! Eddystone-TLM */
            uint8_t   version;           /*<! TLM version,0x00 for now */
            uint16_t  battery_voltage;   /*<! battery voltage in mV */
            float     temperature;       /*<! beacon temperature in degrees Celsius */
            uint32_t  adv_count;         /*<! adv pdu count since power-up */
            uint32_t  time;              /*<! time since power-up, a 0.1 second resolution counter */
        } tlm;
    } inform;
} esp_eddystone_result_t;

/* utils */
static inline uint16_t little_endian_read_16(const uint8_t *buffer, uint8_t pos)
{
    return ((uint16_t)buffer[pos]) | (((uint16_t)buffer[(pos)+1]) << 8);
}

static inline uint16_t big_endian_read_16(const uint8_t *buffer, uint8_t pos)
{
    return (((uint16_t)buffer[pos]) << 8) | ((uint16_t)buffer[(pos)+1]);
}

static inline uint32_t big_endian_read_32(const uint8_t *buffer, uint8_t pos)
{
    return (((uint32_t)buffer[pos]) << 24) | (((uint32_t)buffer[(pos)+1]) >> 16) | (((uint32_t)buffer[(pos)+2]) >> 8) | ((uint32_t)buffer[(pos)+3]);
}

/*
 * The esp eddystone API. 
 * This function is called to decode eddystone information from adv_data. 
 * The res points to the result struct.
 *
 */
esp_err_t esp_eddystone_decode(const uint8_t* buf, uint8_t len, esp_eddystone_result_t* res);

//bool esp_eddystone_is_eddystone_packet(.....);

#endif /* __ESP_EDDYSTONE_API_H__ */