How can I mute the microphone but not the incoming audio?

[zPy52]

Describe the bug

I'm trying to have a timed conversation in which you can always listen but not always talk. The problem is that when I do the following:

if (localStream != null) {
  for (MediaStreamTrack track in localStream!.getAudioTracks()) {
    track.enabled = false; 
  }
}

Both the speaker and the microphone shut down and I can't hear anything. I've tried with #110 but it says that the method setMicrophoneMute does not exist.

Intended behaviour

I can listen to the incoming audio but not speak; aka, send audio streams to the other endpoint.

Platform

I'm trying this on my physical iOS 18.1.1 device, an iPhone 14. This is the info provided by flutter doctor:

Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, 3.29.0, on macOS 15.3.1 24D70 darwin-x64, locale
    es-ES)
[✓] Android toolchain - develop for Android devices (Android SDK version 34.0.0)
[✓] Xcode - develop for iOS and macOS (Xcode 16.2)
[✓] Chrome - develop for the web
[✓] Android Studio (version 2023.2)
[✓] IntelliJ IDEA Community Edition (version 2023.3.3)
[✓] VS Code (version 1.97.2)
[✓] Connected device (2 available)
    ! Error: Browsing on the local area network for iPhone de Antonio. Ensure
      the device is unlocked and attached with a cable or associated with the
      same local area network as this Mac.
      The device must be opted into Developer Mode to connect wirelessly. (code
      -27)
[✓] Network resources

• No issues found!
antoniopenapena@MacBook-Pro-de-Antonio ~ % flutter doctor -v
[✓] Flutter (Channel stable, 3.29.0, on macOS 15.3.1 24D70 darwin-x64, locale
    es-ES) [1.268ms]
    • Flutter version 3.29.0 on channel stable at
      /Users/anton/development/flutter
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision 35c388afb5 (2 weeks ago), 2025-02-10 12:48:41 -0800
    • Engine revision f73bfc4522
    • Dart version 3.7.0
    • DevTools version 2.42.2

[✓] Android toolchain - develop for Android devices (Android SDK version 34.0.0)
    [4,3s]
    • Android SDK at /Users/anton/Library/Android/sdk
    • Platform android-34, build-tools 34.0.0
    • Java binary at: /Applications/Android
      Studio.app/Contents/jbr/Contents/Home/bin/java
      This is the JDK bundled with the latest Android Studio installation on
      this machine.
      To manually set the JDK path, use: `flutter config
      --jdk-dir="path/to/jdk"`.
    • Java version OpenJDK Runtime Environment (build
      17.0.9+0-17.0.9b1087.7-11185874)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 16.2) [2,5s]
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Build 16C5032a
    • CocoaPods version 1.16.2

[✓] Chrome - develop for the web [254ms]
    • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[✓] Android Studio (version 2023.2) [252ms]
    • Android Studio at /Applications/Android Studio.app/Contents
    • Flutter plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/6351-dart
    • Java version OpenJDK Runtime Environment (build
      17.0.9+0-17.0.9b1087.7-11185874)

[✓] IntelliJ IDEA Community Edition (version 2023.3.3) [250ms]
    • IntelliJ at /Applications/IntelliJ IDEA CE.app
    • Flutter plugin version 78.4.2
    • Dart plugin version 233.15123

[✓] VS Code (version 1.97.2) [51ms]
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.104.0

[✓] Connected device (2 available) [7,5s]
    • macOS (desktop) • macos  • darwin-x64     • macOS 15.3.1 24D70 darwin-x64
    • Chrome (web)    • chrome • web-javascript • Google Chrome 133.0.6943.127

[✓] Network resources [574ms]
    • All expected network resources are available.

• No issues found!

Plugin version

flutter_webrtc: ^0.12.11