Enhance voice communication with Push to Talk

func setupChannelManager() async throws {
    channelManager = try await PTChannelManager.channelManager(delegate: self,
                                                               restorationDelegate: self)
}

func joinChannel(channelUUID: UUID) {
    let channelImage = UIImage(named: "ChannelIcon")
    channelDescriptor = PTChannelDescriptor(name: "Awesome Crew", image: channelImage)
  
    // Ensure that your channel descriptor and UUID are persisted to disk for later use.
    channelManager.requestJoinChannel(channelUUID: channelUUID, 
                                      descriptor: channelDescriptor)
}

func channelManager(_ channelManager: PTChannelManager, 
                    didJoinChannel channelUUID: UUID,
                    reason: PTChannelJoinReason) {
    // Process joining the channel
    print("Joined channel with UUID: \(channelUUID)")
}

func channelManager(_ channelManager: PTChannelManager,
                    receivedEphemeralPushToken pushToken: Data) {
    // Send the variable length push token to the server
    print("Received push token")
}

func channelManager(_ channelManager: PTChannelManager, 
                    failedToJoinChannel channelUUID: UUID, 
                    error: Error) {
    let error = error as NSError

    switch error.code {
    case PTChannelError.channelLimitReached.rawValue:
        print("The user has already joined a channel")
    default:
        break
    }
}

func channelManager(_ channelManager: PTChannelManager,
                    didLeaveChannel channelUUID: UUID,
                    reason: PTChannelLeaveReason) {
    // Process leaving the channel
    print("Left channel with UUID: \(channelUUID)")
}

func channelDescriptor(restoredChannelUUID channelUUID: UUID) -> PTChannelDescriptor {
    return getCachedChannelDescriptor(channelUUID)
}

func updateChannel(_ channelDescriptor: PTChannelDescriptor) async throws {
    try await channelManager.setChannelDescriptor(channelDescriptor, 
                                                  channelUUID: channelUUID)
}

func reportServiceIsReconnecting() async throws {
    try await channelManager.setServiceStatus(.connecting, channelUUID: channelUUID)
}

func reportServiceIsConnected() async throws {
    try await channelManager.setServiceStatus(.ready, channelUUID: channelUUID)
}

func startTransmitting() {
    channelManager.requestBeginTransmitting(channelUUID: channelUUID)
}

// PTChannelManagerDelegate

func channelManager(_ channelManager: PTChannelManager, 
                    failedToBeginTransmittingInChannel channelUUID: UUID,
                    error: Error) {
    let error = error as NSError

    switch error.code {
    case PTChannelError.callIsActive.rawValue:
        print("The system has another ongoing call that is preventing transmission.")
    default:
        break
    }
}

func stopTransmitting() {
    channelManager.stopTransmitting(channelUUID: channelUUID)
}

func channelManager(_ channelManager: PTChannelManager, 
                    failedToStopTransmittingInChannel channelUUID: UUID, 
                    error: Error) {
    let error = error as NSError

    switch error.code {
    case PTChannelError.transmissionNotFound.rawValue:
        print("The user was not in a transmitting state")
    default:
        break
    }
}

func channelManager(_ channelManager: PTChannelManager,
                    channelUUID: UUID, 
                    didBeginTransmittingFrom source: PTChannelTransmitRequestSource) {
    print("Did begin transmission from: \(source)")
}

func channelManager(_ channelManager: PTChannelManager,
                    didActivate audioSession: AVAudioSession) {
    print("Did activate audio session")
    // Configure your audio session and begin recording
}

func channelManager(_ channelManager: PTChannelManager,
                    channelUUID: UUID, 
                    didEndTransmittingFrom source: PTChannelTransmitRequestSource) {
    print("Did end transmission from: \(source)")
}

func channelManager(_ channelManager: PTChannelManager,
                    didDeactivate audioSession: AVAudioSession) {
    print("Did deactivate audio session")
    // Stop recording and clean up resources
}

func incomingPushResult(channelManager: PTChannelManager, 
                        channelUUID: UUID, 
                        pushPayload: [String : Any]) -> PTPushResult {

    guard let activeSpeaker = pushPayload["activeSpeaker"] as? String else {
        // If no active speaker is set, the only other valid operation 
        // is to leave the channel
        return .leaveChannel
    }

    let activeSpeakerImage = getActiveSpeakerImage(activeSpeaker)    
    let participant = PTParticipant(name: activeSpeaker, image: activeSpeakerImage)
    return .activeRemoteParticipant(participant)
}

func stopReceivingAudio() {
    channelManager.setActiveRemoteParticipant(nil, channelUUID: channelUUID)
}