Bluetooth Low Energy / Mbed 2 deprecated BLE_EddystoneBeacon_Service Featured

Example program for the Eddystone Beacon service.

Dependencies:   BLE_API mbed nRF51822 X_NUCLEO_IDB0XA1

Fork of BLE_EddystoneBeacon by URIBeacon

This example demonstrates how to set up and initialize a Eddystone Beacon. For more details on the Eddystone specification please see the Eddystone Github Page.

The Basics

An Eddystone Beacon is a Bluetooth Low Energy beacon, that means it does all of its data transfer in GAP advertising packets. Eddystone beacons, unlike other beacons, broadcast multiple types of data. Currently Eddystone beacons have 3 frame types (UID, URL, TLM) that will get swapped out periodically. This swapping of frame data allows Eddystone beacons to send many different types of data, thus increasing their usefulness over traditional beacons. Note that the UID frame type provides the same 16Bytes of UUID namespace that iBeacons do and the URL frame type provides the same functionality as a URIBeacon.

For more details see the Eddystone Specification.

Smartphone Apps

nRF Master Control Panel - this program recognizes Eddystone beacons and will display the data for all frame types.

iPhone Physical Web app

Android App

Walkthrough of Physical Web application

Technical Details

The Eddystone Specification looks like the following image. Please note that this may change over time and for up to date information the official spec should be referenced. /media/uploads/mbedAustin/scratch-1-.png

The Eddystone Frames get swapped in and out depending on what frames you have enabled. The only required frame type is the TLM frame, all others are optional and you can have any number enabled. To disable the UID or URL frames give their values a 'NULL' in the Eddystone constructor. The Eddystone spec recommends broadcasting 10 frames a second.

Note

  • The current Eddystone mbed example does not allow for combining the eddystone service with other services, this will be changes in a future update.
  • There is an Eddystone Config service that allows for updating beacons in the field. We are working on an example for this, so keep your eyes pealed for a future update.

UIDFrame.cpp

Committer:
Vincent Coubard
Date:
2016-09-20
Revision:
36:17b4a0ff9abb
Parent:
34:f6d4a699a1ea

File content as of revision 36:17b4a0ff9abb:

/* mbed Microcontroller Library
 * Copyright (c) 2006-2015 ARM Limited
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "UIDFrame.h"

UIDFrame::UIDFrame(void)
{
    memset(uidNamespaceID, 0, sizeof(UIDNamespaceID_t));
    memset(uidInstanceID,  0,  sizeof(UIDInstanceID_t));
}

UIDFrame::UIDFrame(const UIDNamespaceID_t uidNamespaceIDIn, const UIDInstanceID_t  uidInstanceIDIn)
{
    memcpy(uidNamespaceID, uidNamespaceIDIn, sizeof(UIDNamespaceID_t));
    memcpy(uidInstanceID,  uidInstanceIDIn,  sizeof(UIDInstanceID_t));
}

void UIDFrame::setUIDData(const UIDNamespaceID_t *uidNamespaceIDIn, const UIDInstanceID_t *uidInstanceIDIn)
{
    memcpy(uidNamespaceID, uidNamespaceIDIn, sizeof(UIDNamespaceID_t));
    memcpy(uidInstanceID,  uidInstanceIDIn,  sizeof(UIDInstanceID_t));
}

void UIDFrame::constructUIDFrame(uint8_t *rawFrame, int8_t advPowerLevel)
{
    size_t index = 0;

    rawFrame[index++] = EDDYSTONE_UUID[0];                                   // 16-bit Eddystone UUID
    rawFrame[index++] = EDDYSTONE_UUID[1];
    rawFrame[index++] = FRAME_TYPE_UID;                                      // 1B  Type
    rawFrame[index++] = advPowerLevel;                                       // 1B  Power @ 0meter

    memcpy(rawFrame + index, uidNamespaceID, sizeof(UIDNamespaceID_t));      // 10B Namespace ID
    index += sizeof(UIDNamespaceID_t);
    memcpy(rawFrame + index, uidInstanceID, sizeof(UIDInstanceID_t));        // 6B Instance ID
    index += sizeof(UIDInstanceID_t);

    memset(rawFrame + index, 0, 2 * sizeof(uint8_t));                        // 2B RFU, which are unused
}

size_t UIDFrame::getRawFrameSize(void) const
{
    return FRAME_SIZE_UID + EDDYSTONE_UUID_SIZE;
}

uint8_t* UIDFrame::getUIDNamespaceID(void)
{
    return uidNamespaceID;
}

uint8_t* UIDFrame::getUIDInstanceID(void)
{
    return uidInstanceID;
}