Quick Run-Through

func onRecvCustomCmdMsgUserId(_ userId: String, cmdID: Int, seq: UInt32, message: Data) {
    if cmdID == 1 {
        do {
            if let jsonObject = try JSONSerialization.jsonObject(with: message, options: []) as? [String: Any] {
                print("Dictionary: \(jsonObject)")
                // handleMessage(jsonObject)
            } else {
                print("The data is not a dictionary.")
            }
        } catch {
            print("Error parsing JSON: \(error)")
        }
    }
}

trtcClient.on(Tencent RTC.EVENT.CUSTOM_MESSAGE, (event) => {
    let data = new TextDecoder().decode(event.data);
    let jsonData = JSON.parse(data);
    console.log(`receive custom msg from ${event.userId} cmdId: ${event.cmdId} seq: ${event.seq} data: ${data}`);
        
    if (jsonData.type == 10000 && jsonData.payload.end == false) {
        // Subtitle intermediate state
    } else if (jsonData.type == 10000 && jsonData.payload.end == true) {
       // That's all for this sentence. 
    }
});

@objc func interruptAi() {
    print("interruptAi")
    let cmdId = 0x2
    let timestamp = Int(Date().timeIntervalSince1970 * 1000)
    let payload = [
        "id": userId + "_\(roomId)" + "_\(timestamp)", // Message ID, can use UUID; used for troubleshooting.
        "timestamp": timestamp // Timestamp, used for troubleshooting.
    ] as [String : Any]
    let dict = [
        "type": 20001,
        "sender": userId,
        "receiver": [botId],
        "payload": payload
    ] as [String : Any]
    do {
        let jsonData = try JSONSerialization.data(withJSONObject: dict, options: [])
        self.trtcCloud.sendCustomCmdMsg(cmdId, data: jsonData, reliable: true, ordered: true)
    } catch {
        print("Error serializing dictionary to JSON: \(error)")
    }
}

const message = {
  "type": 20001,
  "sender": "user_a",
  "receiver": ["user_bot"],
  "payload": {
    "id": "uuid",
    "timestamp": 123
  }
};

trtc.sendCustomMessage({
  cmdId: 2,
  data: new TextEncoder().encode(JSON.stringify(message)).buffer
});