iOS iBeacon proximityUUID

Question

I'm looking to use the nRF51822 as an iBeacon transmitter for iOS, reading the docs it appears that I need to know the proximityUUID of the sensor that I can set the OS to tell my app when the OS reads this specific sensors. So far I have been unable to find the proximityUUID of the sensor. From what I've read this should be something read-only on the device, so my question is how can I read this? Any thoughts or suggestions? 
 Thanks 
 iOS details
 developer.apple.com/.../Reference.html

Guest · Accepted Answer

Even though Apple haven't supplied much details on iBeacon, it isn't hard to start one iDevice as an iBeacon, following Apple's documentation, and then replicating the advertising format seen there on an nRF51. 
 This could for example become like this: 
 
typedef __packed struct
{
 uint16_t unknown1;
 uint8_t uuid[16];
 uint16_t major;
 uint16_t minor;
 uint8_t unknown2;
} clbeacon_info_t;
...
static void advertising_init(void)
{
 uint32_t err_code;
 uint8_t flags = BLE_GAP_ADV_FLAG_BR_EDR_NOT_SUPPORTED;
 ble_advdata_t advdata;
 
 uint8_t uuid[16] = {0x01, 0x12, 0x23, 0x34, 0x45, 0x56, 0x67, 0x78, 0x89, 0x9a, 0xab, 0xbc, 0xcd, 0xde, 0xef, 0xf0};
 
 clbeacon_info_t beacon_info;
 beacon_info.unknown1 = 0x1502;
 memcpy(&beacon_info.uuid, &uuid, sizeof(uuid));
 beacon_info.major = 0x3412;
 beacon_info.minor = 0x7798;
 beacon_info.unknown2 = 0xC5;

 ble_advdata_manuf_data_t manuf_specific_data;
 manuf_specific_data.company_identifier = 0x004C;
 manuf_specific_data.data.p_data = (uint8_t *) &beacon_info;
 manuf_specific_data.data.size = sizeof(beacon_info);
 
 // Build and set advertising data
 memset(&advdata, 0, sizeof(advdata));
 
 advdata.name_type = BLE_ADVDATA_NO_NAME;
 advdata.flags.size = sizeof(flags);
 advdata.flags.p_data = &flags;
 advdata.p_manuf_specific_data = &manuf_specific_data;
 
 err_code = ble_advdata_set(&advdata, NULL);
 APP_ERROR_CHECK(err_code);
}


/**@brief Start advertising.
 */
static void advertising_start(void)
{
 uint32_t err_code;
 ble_gap_adv_params_t adv_params;
 
 // Start advertising
 memset(&adv_params, 0, sizeof(adv_params));
 
 adv_params.type = BLE_GAP_ADV_TYPE_ADV_NONCONN_IND;
 adv_params.p_peer_addr = NULL;
 adv_params.fp = BLE_GAP_ADV_FP_ANY;
 adv_params.interval = APP_ADV_INTERVAL;
 adv_params.timeout = APP_ADV_TIMEOUT_IN_SECONDS;

 err_code = sd_ble_gap_adv_start(&adv_params);
 APP_ERROR_CHECK(err_code);
 nrf_gpio_pin_set(ADVERTISING_LED_PIN_NO);
}

...