mrverrall / go-row

Connect Concept2 rowers to Zwift. Go-row is a Bluetooth LE bridge, written in Go, to convert a Concept2 PM5 rower into a Cycle Power and a Running Speed Service. This enables you to use a Concept2 rower with cycling/running games such a Zwift.

go-row

Go-row is a Bluetooth LE bridge written in Go. It re-transmits a Concept2 PM5 rowers metrics as Bluetooth 'Cycle Power' and 'Running Speed' services. This allows you to use a Concept2 rower in cycling or runnning games such a Zwift.

You can now install gow-row as a simple deb package for Raspbian.

Cycling cadance is set to 3x the rowing SPM and running cadance 6x.

Quick Start

Raspberry Pi package (deb)

The go-row deb package can be download from the releases page. Below is an example of installing via the command line. The package will install go-row as a service that starts on boot, perfect for a headless system.

# Download
wget https://github.com/mrverrall/go-row/releases/download/v0.0.1-2/go-row_0.0.1-2_armhf.deb

# Install
sudo dpkg -i go-row_0.0.1-2_armhf.deb

Go-row should now be running as a service, you can check this with,

systemctl status go-row

From Source

Assuming a clean install of Raspbian on an Raspberry Pi Zero W...

apt-get install golang
go get "github.com/mrverrall/go-row"
sudo ~/go/bin/go-row

Connecting to your Rower and Game

While go-row is running select 'connect' from the main PM5 menu, connection is then automatic.

Once connected to a PM5 go-row will advertise the cycle and running services. Within your game/app select the 'go-row' device.

Row!

Installing as a service

N.B. This is not needed if you installed go-row using the debian package.

An example systemd service file is included in this repository.

To install as a boot service with systemd, edit the "ExecStart" path in the service file to the location your compiled go-row executable.

Copy your service file to '/var/lib/systemd/system/go-row.service'. then,

sudo systemctl daemon-reload
sudo systemctl enable go-row.service
sudo systemctl start go-row.service

Check your service is ruuning with,

sudo systemctl status go-row.service

go-row's Issues

Cadence too high

Hi, this works really well except the cadence is seventy-something when I'm only at twenty something strokes per minute. I tried changing *3 to *1 in cpm.go, but clearly that isn't the bit I need to change! Can you help please?

Docs: Example usage?

It’d be good if the docs showed how you’d install/run this. Not sure what commands would need to be run and how to pair it to a rower?

Will not exit with SIGTERM causing issues when run as a service

Crash on OS interrupt in some states.

Not a massive issues as It's an interrupt so you wanted to close anyway, but need to handle this scenario.

2020/06/23 10:30:55 PM5 error: Unresolvable connection error: can't scan: context deadline exceeded
^C2020/06/23 10:30:58 signal received from os: interrupt
panic: close of closed channel

goroutine 1 [running]:
github.com/go-ble/ble/linux/hci/socket.(*Socket).Close(0x1043660, 0x0, 0x0)
/home/pi/go/src/github.com/go-ble/ble/linux/hci/socket/socket.go:148 +0x30
github.com/go-ble/ble/linux/hci.(*HCI).close(0x107c360, 0x0, 0x0, 0x101a03c, 0x101a03c)
/home/pi/go/src/github.com/go-ble/ble/linux/hci/hci.go:327 +0x50
github.com/go-ble/ble/linux/hci.(*HCI).Close(0x107c360, 0x1000194, 0x108d14)
/home/pi/go/src/github.com/go-ble/ble/linux/hci/hci.go:169 +0x2c
github.com/go-ble/ble/linux.(*Device).Stop(0x100eb00, 0x108d0c, 0x10000e0)
/home/pi/go/src/github.com/go-ble/ble/linux/device.go:105 +0x20
github.com/go-ble/ble.Stop(0x1000001, 0x1077f9c)
/home/pi/go/src/github.com/go-ble/ble/gatt.go:52 +0x34
main.unsetBT()
/home/pi/go/src/github.com/mrverrall/go-row-cycle/go-row-cycle.go:65 +0x14
main.main()
/home/pi/go/src/github.com/mrverrall/go-row-cycle/go-row-cycle.go:33 +0x104

Relay HRM data from PM5

Add support for a SPM-Cadence scaling factor

In-game avatars look weird riding at the usual rowing spm/cadence of ~30. As cadence doesn't impact in-game performance, look to add a command line switch to scale this if desired.

I don't think this is reasonable for power, a watt is a watt.

Make available as a deb package for Raspberry PI OS

Greatly simplify the process of getting started for less technical users.

Connection of upstream client to the Cycle service blocks scanning for PM5

Needs better/more code comments

PM5 reconnects after setting wireless to off

Not sure if this is my bug or theirs, but the PM5 will not power down automatically as long as there is an active wireless connection, however even if you turn wireless off on the PM5 it will allow go-row-cycle to reconnect.
go-row-cycle implements a 5s cooling off period when a PM5 disconnects, extending this might mitigate against the issue, but would also delay dynamic reconnects if we experience a disconnection mid session.
Need to investigate ways to mitigate against this without compromising user experience.

Zero heartrate reports as 255 BPM

PM5 transmits an empty HR as 255 rather than 0