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Returns nil
API modem
Source CC:Tweaked (source)

Opens a channel on a modem. A channel must be opened to receive messages from it. A modem can only have 128 channels open at the same time.

channel must be a number between 0 and 65535.

Error creating thumbnail: Unable to save thumbnail to destination
ExampleOpen channel 42
Open channel 42.
local modem = peripheral.find("modem")