Global Caché makes network devices and serial adapters that let you send and receive consumer infrared signals, sense and trigger relays, talk to remote serial ports, and such. They've been around for a while.
This Indigo 5 plugin lets you talk to those devices from Indigo. In particular, you can send and respond to CIR (Consumer Infrared) signals.
Requires the kind of Global Caché device that does what you want to do.
Download the zip file. Double-click it to expand. Double-click the resulting plugin to install.
Select the About Cynical Caché menu item for usage instructions. Post in _Perry The Cynic_'s third party developer forum for questions, comments, and complaints.