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Klangbruecke v0.2.2

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@MYSTRAVIL MYSTRAVIL released this 08 Aug 09:31
v0.2.2
13900c6

Klangbruecke bridges phone audio to your PC over Bluetooth on the built-in radio — music (A2DP sink)
and cellular calls (HFP hands-free) in one tray app. No USB dongle, no second app.

This build

  • Both halves work and recover unattended. Music and calls come back on their own after the phone
    leaves and returns to range, after a reboot, and on a phone-initiated reconnect.
  • Fast reconnect. Phone-initiated reconnect is bounded to ~5 s by a reconnect probe — the Bluetooth
    DeviceWatcher never fires on reconnect, so a short probe closes the gap the 30 s reconcile poll used
    to leave.
  • State-reflecting tray icon — blue = connected, amber = connecting / degraded, grey = idle.

Known limitations

  • Windows 10 (19041+) only. Not Windows 11 — call registration is blocked there for sideloaded apps,
    and Win11 has an A2DP-capture regression this app depends on.
  • Outgoing call audio can be narrowband depending on your Bluetooth stack (a 2021 MediaTek RZ616
    driver forces a narrowband SCO codec — this is the driver, not the app).
  • No in-app call-output picker. Call audio follows the system default communications device; set it
    in Windows Sound settings.

First public build, so it is marked a prerelease. Requires the one-time certificate-trust step below.

Install

Klangbruecke is a sideloaded MSIX signed with a self-signed certificate, so Windows will not install
it until that certificate is trusted. There is no "install anyway" prompt for MSIX - this step is
required, and it is a one-time thing per machine.

1. Trust the certificate (one time, from an elevated PowerShell):

Import-Certificate -FilePath .\Klangbruecke.cer -CertStoreLocation Cert:\LocalMachine\TrustedPeople

2. Install (or upgrade) the app - from Windows PowerShell, not PowerShell 7 (the Appx module
does not load in pwsh):

Add-AppxPackage -Path .\Klangbruecke-0.2.2.msix

Klangbruecke then starts automatically and lives in the system tray. Windows 10 build 19041 or later
is required. See the README for what it does and
how to test music and calls.

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