Bluetooth

No ANT+ stick? The trainer, a heart-rate strap and a power meter can each connect over your PC's Bluetooth instead.

New and not yet tried with real devices. Bluetooth was tested against a simulated Bluetooth stack. ANT+ remains the default.

What you need

A trainer that supports FTMS (Fitness Machine Service). Most current smart trainers do.
Optionally, a Bluetooth heart-rate strap or power meter (Cycling Power).
Windows 10 or 11, and a Bluetooth 4.0 (LE) adapter, built in or a USB dongle.

Pair the device with Windows. Pedal to wake the trainer, then open Settings → Bluetooth & devices → Add device → Bluetooth and pick it. The mod only sees paired devices.

Switch it on in RDR2BikeMod.ini:

[Trainer]
Connection = Bluetooth
; with several paired trainers, part of the right one's name:
BluetoothName = DIRETO

The same Connection key is in [PowerMeter] and [HeartRate].

One app at a time. A Bluetooth trainer takes commands from one app only. Close Zwift, the trainer maker's app, or a bike computer connected to it over Bluetooth first.
Mix and match. Each sensor can use either connection, so an ANT+ trainer with a Bluetooth heart-rate strap works too.
The same riding. The slope goes to the trainer with the same rules as over ANT+, and the trainer is set back to flat when the mod stops.

The panel says	What to try
`Bluetooth: not available`	The PC has no Bluetooth adapter, or it is switched off. The log says which.
`Trainer: looking for it (Bluetooth)...`	Pair the trainer in Windows first: it must be listed under Settings → Bluetooth & devices. Pedal to wake it. Close other apps connected to it. If you set `BluetoothName`, check the spelling.
`(no slope mode)` after the trainer's name	The trainer says it can't simulate slopes over Bluetooth. Try ANT+ if it has it.