AntiLost: Difference between revisions
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== Introduction == | == Introduction == | ||
This page is about so-called "anti-lost" tags and understanding how to communicate with them. | |||
They act as a Bluetooth low-energy (BLE) GATT server, implementing a bunch of services. | |||
This allows them to implement the following functions: | This allows them to implement the following functions: | ||
* read out general characteristics of the anti-lost, like the name | * read out general characteristics of the anti-lost, like the name | ||
* read out battery level of the anti-lost | * read out battery level of the anti-lost | ||
* enable beeping from the client | * enable beeping from the client (e.g. smartphone) | ||
* notify when the button is pressed on the anti-lost | * notify when the button is pressed on the anti-lost | ||
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* start beeping when the connection is lost (silenced by a button press) | * start beeping when the connection is lost (silenced by a button press) | ||
== Technical == | |||
=== GATT services === | |||
[[File:AntiLostServices.png|thumb|right|250px|BLE GATT services advertised]] | |||
See https://en.wikipedia.org/wiki/Bluetooth_Low_Energy#Technical_details | |||
The services exposed by the anti-lost are: | |||
* 0x1800: generic access for name and type of device | |||
* 0x180F: battery service, allows you to read the battery level characteristic | |||
* 0x1802: immediate alert, allows you to make the anti-lost beep | |||
* 0x000FFE0-0000-1000-80000-00805F9B34FB: allows you to get notified when the button is pressed | |||
=== BLE on ESP32 === | |||
The ESP32 is capable of doing BLE operations. | |||
In particular, this library allows you to control the anti-lost as a GATT device: https://github.com/nkolban/ESP32_BLE_Arduino | |||
Relevant example code is BLE_client.ino | |||
Revision as of 07:12, 18 August 2018
| Project AntiLost | |
|---|---|
| |
| Status | Initializing |
| Contact | bertrik |
| Last Update | 2018-08-18 |
Introduction
This page is about so-called "anti-lost" tags and understanding how to communicate with them.
They act as a Bluetooth low-energy (BLE) GATT server, implementing a bunch of services.
This allows them to implement the following functions:
- read out general characteristics of the anti-lost, like the name
- read out battery level of the anti-lost
- enable beeping from the client (e.g. smartphone)
- notify when the button is pressed on the anti-lost
Also:
- start beeping when the connection is lost (silenced by a button press)
Technical
GATT services
See https://en.wikipedia.org/wiki/Bluetooth_Low_Energy#Technical_details
The services exposed by the anti-lost are:
- 0x1800: generic access for name and type of device
- 0x180F: battery service, allows you to read the battery level characteristic
- 0x1802: immediate alert, allows you to make the anti-lost beep
- 0x000FFE0-0000-1000-80000-00805F9B34FB: allows you to get notified when the button is pressed
BLE on ESP32
The ESP32 is capable of doing BLE operations.
In particular, this library allows you to control the anti-lost as a GATT device: https://github.com/nkolban/ESP32_BLE_Arduino Relevant example code is BLE_client.ino