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When I started working on the Stratos Card, thecard’s Bluetooth Low Energy (BLE) interface was one of the first things wedesigned. This was my first experience with BLE and I was learning the detailsof the protocol and how we could stretch it to support something morecomplicated than a simple sensor. We ended up (like many others using BLE) withan RPC service built on top of GATT services and characteristics.
This post is about the origins PyGATT, a Python library webuilt to interact with BLE peripherals from a standard (non-mobile) desktop orlaptop development environment.
Mobile First?
Once we drafted the BLE interface in firmware, I searched for but found very fewBLE testing tools or libraries for desktop development environments. In 2014 itseemed like most engineers jumped straight to prototyping BLE applications onmobile devices (likely their target platform since BLE is popular forwearables). I was interested in a more flexible environment so we could automateour hardware testing with a continuous integration server. The non-mobile toolsI did find were all interactive or GUI-based, without a good way toprogramatically control the connection.
Perhaps unsurprisingly, the tooling for “regular” Bluetooth 2.0/3.0 doesn’t seemmuch better. I experienced Bluetooth 2.0/3.0’s simplest profile, SPP,while developing OpenXC’s wireless vehicleinterface. Without jumping into the complicated world of BlueZ (the primaryBluetooth stack for Linux), connecting and pairing was a command-line interfacegame and I/O for SPP was just a “dumb” COM port.
I think the reason for the lack of good tooling for any version of Bluetooth onthe desktop is the simple fact that it just isn’t the target platform for themajority of Bluetooth devices. I don’t write code on my phone though, and thepotential for automated testing and CI was a big incentive for me to have adesktop interface.
BlueZ’s gatttool
An incredibly useful tool from BlueZ for experimenting with BLE is
gatttool
(Linux only). It provides an interface to all of the basic features of BLE -connecting, bonding and reading and writing characteristics, etc. MichaelSaunby (@msaunby) created a brilliant Pythonwrapper for gatttool
, specificallyto connect to TI’s SensorTag project. When I discovered his project, I realizedthe missing piece for BLE on a desktop was a standard API for the Bluetoothstack running on the host OS. BlueZ’s support for BLE was still half-baked (it’smore complete now) and Microsoft only introduced support in Windows 8.At least on Linux we could take Michael’s approach with
gatttool
and changethe API to be more generic and not device specific. The design grew organicallyout of his original SensorTag code as I began to understand the quirks ofwrapping a command line tool with an API. The first API was still very specificto gatttool
, but using it with CSR8510-based USBadapter to connect to the Stratos Cardproved to be fairly reliable.Cross-Platform Support
Eventually, we started looking for ways to provide cross-platform support onWindows and Mac OS X. The fact that
gattttool
is using BlueZ means that itrequires Linux. We got by for a while by running the code in an Ubuntu VM(provisioned with Vagrant), but that couldn’t scale - our CI is in Linux, QAtesters use Mac OS X, and manufacturing testing uses Windows. All three requiredaccess to the same BLE interface.The Bluegiga BLED112dongleis compelling because it has a self-contained BLE stack and doesn’t require anysoftware support on the host computer. The adapter uses the proprietary butwell-documented BGAPI from Bluegiga and Jeff Rowberg(@jrowberg) already implemented it in Pythonfor us.
Steven Sloboda (@sloboste), one of the greatsummer interns at Stratos, bolted BGLIB into PyGATT and refactored the API tosupport different BLE backend implementations.
PyGATT
And so, PyGATT is born. PyGATT provides aBLE adapter agnostic Python API to interact with BLE peripherals. It currentlysupports any BLE adapter compatible with BlueZ in Linux, and anyBGAPI-compatible adapter on any platform. Here’s an example using aBGAPI-compatible adapter to connect and read characteristic:
Find the code on GitHub. This project isthe work of a number of contributors - find those that I didn’t mention here inthe contributorslist.
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![Rebel Galaxy (2015) Mac Os X Rebel Galaxy (2015) Mac Os X](https://macgamesland.com/uploads/posts/2020-04/1587172051_screenshot-1-rebel-galaxy.jpg)
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Rebel Galaxy (2015) Mac Os X 10.8
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