Display program for embedded controllers, like the Breezy emergency ventilator.
The main program in this directory is an Android/Flutter application that gathers data from an embedded device, and displays it in graphical and numeric form. It is used for the Breezy Ventilator, but can be configured to display time-based data from any source. Data can be sent over a USB serial cable, Bluetooth/RFCOMM, an outgoing socket, or an incoming socket. A straightforward JSON file can be sent from the device (or anywhere else) to configure the appearance of the screen(s) and the nature of the data feed.
No provision is made for control of the device. For a ventilator this is inappropriate, because interacting with a capacitive screen while wearing gloves is impractical.
This code and app are offered under the MIT License, which allows it to be used freely, but includes a strong liability disclaimer.
This application targets all Android platforms on which Flutter is supported. As of this writing, it has not been tried on iOS, but it should be possible to build it there. All of the libraries it uses support iOS, with the exception of the bluetooth libraries. For the iPhone, the application should build and run, but this has not been tested. Bluetooth support would require more work.
Flutter is available on Android devices "armeabi-v7a (ARM 32-bit), arm64-v8a (ARM 64-bit), and x86-64 (x86 64-bit)." Alas, "Flutter does not currently support building for x86 Android." - see https://flutter.dev/docs/deployment/android#what-are-the-supported-target-architectures.
The display and data feed can be configured with a straightforward file in a JSON syntax. This is described in detail in the configuration document.
Breezy-Display supports communication via USB/Serial Port, Bluetooth/RFCOMM, an outgoing socket to a URL, or an incoming socket. Once connected, there's a simple text protocol for sending data, and a small number of commands that the device can send to the display. Details are available in the protocol and commands document.
Development is being done on Android Studio. That's a big download and a lot of
installation, though. It should be possible to deploy and run if you have the
Android SDK, and the Flutter SDK.
If there are problems, flutter doctor might be helpful.
flutter clean
flutter build appbundle
makes a build for the Play Store. Alternately,
flutter clean
flutter build apk --split-per-abi
makes APKs suitable for github.