Use other remotes to control Apple TV
You can use a supported TV or receiver remote, a network-based remote for home-control systems, or an infrared remote (commonly known as a universal remote) to control Apple TV.
If your TV or receiver supports HDMI-CEC, Apple TV uses the HDMI connection to allow it to be controlled by your TV or receiver remote. For more information, see the Apple Support article If you can't control your Apple TV with your home theater or universal remote.
Use a network-based remote to control Apple TV
A network-based remote sends signals to Apple TV through a network so the remote doesn’t have to be pointed directly at Apple TV.
Before you can use a network-based remote for home-control systems with Apple TV, you first need to add the remote to the Home app on an iPhone or iPad. Make sure the remote is turned on and connected to your network.
Go to the Home app on your iPhone or iPad.
Tap , tap Add Accessory, then follow the onscreen instructions.
You may need to scan or enter an 8-digit HomeKit setup code found on the remote itself (or on its box or in its documentation). You can assign the remote to a room, as well as give it a name. The name defines how it’s shown in the Home app and on Apple TV, and also how you control it using Siri.
Use a universal infrared remote to control Apple TV
To use a universal infrared (IR) remote, you need to let Apple TV learn the signals that the remote generates.
Go to Settings on Apple TV.
Go to Remotes and Devices, then choose Learn Remote, and follow the onscreen instructions.
Note: Another option for programming some universal remotes is to enter a configuration code for Apple TV. Check the documentation that comes with your device.