Control LifeSpan treadmill from C# (treadmill drops connection if not kept alive)

LifeSpan.cs

// License: MIT

using System;
using System.Collections.Concurrent;
using System.IO;
using System.Linq;
using System.Threading.Tasks;

public class LifeSpanTreadmill: IDisposable
{
    readonly Stream toDevice, fromDevice;
    readonly byte[] responseBuffer = new byte[8];
    volatile bool stop;
    readonly Task keepAliveLoop;
    readonly ConcurrentQueue<Action> requests = new ConcurrentQueue<Action>();

    public LifeSpanTreadmill(Stream toDevice, Stream fromDevice) {
        this.toDevice = toDevice ?? throw new ArgumentNullException(nameof(toDevice));
        this.fromDevice = fromDevice ?? throw new ArgumentNullException(nameof(fromDevice));
        this.keepAliveLoop = Task.Run((Action)this.KeepAliveLoop);
    }

    public LifeSpanTreadmill(Stream deviceStream) {
        this.toDevice = this.fromDevice = deviceStream ?? throw new ArgumentNullException(nameof(deviceStream));
        this.keepAliveLoop = Task.Run((Action)this.KeepAliveLoop);
    }

    public void Start() => this.SendCommand(Command.Start);
    public void Stop() => this.SendCommand(Command.Stop);

    void KeepAliveLoop() {
        while (!this.stop) {
            while (this.requests.TryDequeue(out Action action))
                action();

            this.SendInitSequence();
            long speed = this.SendPacket((uint)Command.GetSpeed);
        }
    }

    void SendInitSequence() {
        long[] resposes = new uint[] {
            0x20000000,
            0xC2000000,
            0xE9FF0000,
            0xE400F400,
        }.Select(this.SendPacket).ToArray();
    }

    long SendCommand(Command command) => this.SendCommandAsync(command).Result;

    Task<long> SendCommandAsync(Command command) {
        var result = new TaskCompletionSource<long>();
        this.requests.Enqueue(() => {
            try {
                this.SendInitSequence();
                long response = this.SendPacket((uint)command);
                result.TrySetResult(response);
            } catch (Exception e) {
                result.TrySetException(e);
            }
        });
        return result.Task;
    }

    long SendPacket(uint command) {
        byte[] bytes = BitConverter.GetBytes(command);
        if (BitConverter.IsLittleEndian)
            Array.Reverse(bytes);
        this.toDevice.Write(bytes, 0, 4);
        this.toDevice.WriteByte(0);
        this.toDevice.Flush();
        int read = this.fromDevice.Read(this.responseBuffer, 0, 6);
        if (read < 6)
            throw new NotSupportedException();
        long result = BitConverter.ToInt64(this.responseBuffer, 0);
        return result;
    }

    static decimal ToDecimal(long response) => response & 0xFF;

    public void Dispose() {
        this.stop = true;
        this.keepAliveLoop.Wait();
    }

    enum Command: uint
    {
        Start = 0xE1000000,
        Stop = 0xE0000000,
        GetSteps = 0xA1880000,
        GetCalories = 0xA1870000,
        GetDistance = 0xA1850000,
        GetTime = 0xA1890000,
        GetSpeed = 0xA1820000,
    }
}

@lukescott by now I don't really remember. Also, one really annoying thing is that I had to also send something to keep connection alive. And as soon as it disconnected, I had to do something on the treadmill to reconnect again.

@lostmsu do you remember what serial protocol was used?

@lukescott no, I do not. Judging by the year, I might have used the new WinRT APIs to communicate with the Bluetooth device.

@lukescott well, guess what, you are in luck. I dug up the full project: https://github.com/lostmsu/Xrcise

@lostmsu Thank you so much!

Oh I thought your program was serial. It's bluetooth. Dang it. My console is non-bluetooth version :(.

This is a serial version I stumbled across: https://gist.github.com/daeken/a3d3c4da11ca1c2d2b84

Trying to get data over Serial. It's not standard. (My model is TR5000). So far I have discovered pin 2 is COM ground. RS232 COM is pin 5, and RS422/RS485 is pin 1 (I think?). It appears 12 volts powers the console on pin 1. I don't have an Oscilloscope so guessing which pin is what beyond COM with a multimeter is tricky. I was able to find out COM was pin 2 because I took apart the console and did a continuity test on USB ground.

@lukescott this connects to the console via the Bluetooth. The console has to be plugged in. I believe the Bluetooth receiver is in the console.

@lostmsu Yeah, sadly mine doesn't have bluetooth. The refreshed GlowUp versions is Retro without bluetooth or the new Omnihub with bluetooth. When I opened mine up, there is a spot for the bluetooth module that's empty. I got mine second hand, so I didn't really have much choice in what console I got. Good deal.

@lukescott Will a RS-232 Tester work?

https://www.amazon.com/CableMax-RS-232-link-Tester-Female/dp/B004OT995U

@icnocop sadly it’s non standard. Even if it was RS-232, the pins are not where they should be. I don’t have the tools needed to decode the signal. Sticking the wrong voltage on the wrong pins could cause damage. I was lucky to not cause any harm with the probing I did do. - I’m updating my retro console to the Omni hub and giving Bluetooth a shot.