What

This is an Ant+ to BLE (Bluetooth Low Energy) Bridging app for ANT+ Cycling Speed and Cadence (CSC) sensors, ANT+ heart rate sensors, and ANT+ Stride based speed and distance sensors. The app will act as a Cycling speed/cadence and/or HR BLE sensor and/or BLE Running speed/cadence so other BLE device (phone, PC, Mac, tablet) can reads data from ANT+ sensors.

V1.3 screenshot	pre V1.3 screenshot (old original version)

Install

Or you can download the apk in release and use adb to install:

adb install -r /path/to/app-release.apk

Details

This is an Android app which reads ANT+ cycling speed/cadence (CSC), heart rate sensors, and/or stride based speed and distance (SDM) sensors in the background (actually in an Android foreground service), and advertises itself as a Bluetooth Low Energy (BLE) device which implements Cycling Speed and Cadence Profile (CSCP), Heart Rate Profile (HRP), and/or Running Speed and Cadence (rsc) so that other devices can see this Android device as a Cycling Speed & Cadence Bluetooth, Heart Rate BLE sensor and/or Running foot pod sensor.

This is useful when you only have ANT+ CSC/HR sensors but you want to connect to them as BLE sensors (provided that you don't have an USB ANT+ stick around but happen to have an ANT+ enabled Android device like a Samsung phone).

Long hold on the sensors name on top of the screen to rescan for Ant+ devices after the "Start BLE bridging" button has been pressed. All sensors will automatically scan for Ant+ sources when the "Start BLE bridging" button is pressed.

Why

I want to try out Zwift desktop version but I can't get a USB ANT+ Stick anywhere now in my country (due to the C-19 pandemic). So I decided to write one.

I can now sees my speed and cadence coming from ANT+ sensors on Zwift Mac without the need of extra hardware.

Special thanks to pinkemma who implements Heart Rate sensor profile so that this app also reads heart rate from ANT+ sensor and bridges it to bluetooth. (see PR #5 since 10/2020)

Tested devices

ANT+ and BLE enabled Android devices

• Samsung Galaxy S8 (Android 9)
• Samsung Galaxy J5 2016 - Thanks louisJ20
• Samsung Galaxy S9 (Android 10) - Thanks pinkemma
• One Plus 7 Pro (Android 10) - Thanks michaelrhughes
• Nokia 7 Plus (Android 10) - Thanks leaskovski
• Nexus 5 (CyanogenMod 13 and Ant+ Enabler) - Thanks leaskovski
• OnePlus 5T (Android 10) - Thanks philharle
• Galaxy Note 9 - Thanks larryb84
• Samsung Galaxy S10 (Android 11) - Thanks Chris

ANT+ Speed/Cadence sensors

• Garmin gen 1 ANT+ only speed and cadence sensor
• Garmin speed cadence combined sensor - Thanks louisJ20

ANT+ Heart Rate sensors

• Garmin HRM-Run
• Garmin HRM3-SS - Thanks philharle
• Garmin Fenix 5s with broadcasting mode on (ANT+ signal) - Thanks pinkemma
• Garmin 935 with broadcasting mode on (ANT+ signal)
• Garmin Fenix 6 with broadcasting mode on (ANT+ signal)
• Garmin HRM2 - Thanks larryb84
• Garmin Fenix 5 with broadcasting mode on (ANT+ signal) - Thanks Chris
• Garmin HRM Tri - Thanks Chris

ANT+ Stride-based Speed and Distance Monitor (SDM) sensors

• Garmin Foot Pod

Apps that use BLE sensors

• Zwift (Mac/iPad/Windows version)
• The Sufferfest (Mac version)
• Zwift (iPad Pro)
• theoretically all other apps that use Bike Speed/Cadence or Heart Rate or Run Speed/Cadence BLE sensors

Known issues

• On my Samsung S8 sometimes the bluetooth PHY is messed up (for unknown reason). I have to reboot the phone to get it working. (When it doesn't work, the advertising reports success but actually you can't see any).

Reference

Code samples:

• Bluetooth GATT Server Sample
• Android ANT+ SDK sample

Spec and Document

• ANT+ Basic
• Introduction to Bluetooth low energy
• CH4 of Getting Started with Bluetooth Low Energy
• Bluetooth GATT Specifications
  • Cycling Speed and Cadence Profile/Service
  • Heart Rate Profile/Service
  • Bluetooth Assigned numbers