This Project is an open source Android powered Home Automation Bus, heavily inspired by OpenHAB. It is nowhere near as fully featured as OpenHAB, nor does it aim to be; it's a hobby Android project.
There are 2 main components:
- An Android DNS-based Service Discovery (DNS-SD) Near Service Discovery (NSD) Server.
- An Android client that connects to the server.
NOTE: It is highly recommended to run the server on an Android Things device to avoid permission prompts for Bluetooth or USB, and the availability of USB ports.
Each connected client opens a socket on the server, and writes and reads lines over the socket's input and output streams. These lines contain
serialized representations of the
Payload class which hosts various properties to describe whatever communications have taken place.
The Android Server interfaces with end devices to be controlled via the
CommsProtocol abstract class. Implementations of this class
are responsible for liaising input commands from the client to the devices it connects to and reporting any results back to the client.
Client requests are responded to synchronously for immediate feedback. Should a request require asynchronous processing, a
PrintWriter is provided
in the constructor of the class, which writes to the same socket output stream. Whatever is written out of these PrintWriter must also be a serialization of the
Payload class, else the client will fail to parse and interpret it.
The Server supports multiple client connections, limited only by the size of the thread pool in ServerNsdService.
A demo protocol that tells knock knock jokes
Controls ZigBee Devices using Texas Instrument's CC2531 dongle running the Zstack, it interfaces with the dongle over USB. This protocol pretty much just proxies Zsmartsystems console app. Theoretically, any supported dongle there can be supported here provided a supported serial implementation is provided. The current Serial implementation has no support for flow control, and so is limited to the TI CC2531.
Sniffs and controls 433 MHz devices with an Arduino, essentially replacing the device's bundled remote. A video overview can be see here.
There are two implementations:
- Wired, using a USB serial.
- Wireless, using Bluetooth Low Energy and Silicon Lab's BLE112
Description of the wireless implementation follows:
The Arduino GATT Server
The Arduino GATT server is comprised of:
- An Arduino Mega
- The BLE112 Module from Silicon Labs
- A Generic RF Receiver
- A Generic RF Transmitter
An Arduino Mega, while not necessary is preferred because of the avaialabilty of more than 1 hardware serial. An Uno is fine provided debug messages are fed to a software serial, but the BLE communication should always use a hardware serial as it is way more Reliable.
The Android GATT Client
The Android GATT client provides a convenient UI for the server. After following the prompts to a connect to a Arduino server, the app will automatically attempt to connect to it whenever it is within range.
The app assumes the switches it controls has 2 states, ON and OFF. To Create a switch, the app prompts a user to sniff the ON code and OFF code consecutively, after which a switch will be created with a UI to toggle between the ON and OFF states. Once a switch is created, it is persisted in the app unless it is deleted with a swipe on the UI. Long pressing a switch brings up a dialog to rename the switch.
Copyright (c) 2019 Adetunji Dahunsi
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