OpenDisplayNet is a standalone .NET library for discovering and controlling OpenDisplay Bluetooth Low Energy displays from Windows. It implements the OpenDisplay BLE protocol, including fast PIPE_WRITE image transfer, for applications that want to render their own content on e-paper displays.

• Discover advertising and paired OpenDisplay BLE devices.
• Read display configuration, panel dimensions, firmware information, sensors, and manufacturer data.
• Upload System.Drawing.Bitmap instances or image files with panel-aware palette reduction and ordered dithering, or send caller-encoded frames through Direct Write or negotiated PIPE_WRITE.
• Authenticate encrypted sessions, send partial updates, and control LEDs and buzzers.

Discover a device, connect to it, and upload a bitmap. The library resizes it to the panel and converts it to the panel's configured color scheme:

using System.Drawing;
using OpenDisplayNet;

IReadOnlyList<OpenDisplayDevice> devices = await OpenDisplayDiscovery
    .DiscoverAsync(TimeSpan.FromSeconds(10));

OpenDisplayDevice device = devices.First();
using OpenDisplayClient client = await OpenDisplayClient.ConnectAsync(device);

using Bitmap bitmap = new("dashboard.png");
using OpenDisplayImage image = new(bitmap);
await client.SendImageAsync(image);

// Or load directly from a file.
using OpenDisplayImage fileImage = new("dashboard.png");
await client.SendImageAsync(fileImage);

Create OpenDisplayImage from a caller-encoded frame when conversion is handled elsewhere:

using OpenDisplayImage encodedImage = new(encodedFrame);
await client.SendImageAsync(encodedImage);

dotnet build OpenDisplayNet.slnx
dotnet test OpenDisplayNet.slnx
dotnet run --project samples\ConsoleTest\ConsoleTest.csproj
dotnet run --project samples\WinApp\WinApp.csproj -p:Platform=x64

The test application scans until a device is selected, reads its panel configuration, and uploads a matching test image.

• OpenDisplay website and firmware toolbox
• OpenDisplay protocol specification
• OpenDisplay firmware and hardware documentation
• Reference Python implementation