IR.RF Command Length

I have just set up HASS and have a question in regards to a IR/RF command. If have captured the command successfully from HASS from my broadlink RM Pro. However the RF command is approx 1200 characters long.

How can I split up the RF command (command_on below) over multiple lines?
Is there a limit to the length of the command that HASS.IO will except?

    command_on: '1200charslong'