M118 - Serial print

hosts Send text to serial

Send a message to the connected host for display in the host console or to perform a host action.

The E, A, and P parameters must precede the message.

Can also send the message to the serial port for hosts to display.

M118 [A1] [E1] [Pn<0|1|2>] [string]

`[A1]`	Prepend `//` to denote a comment or action command. Hosts like OctoPrint can interpret such commands to perform special actions. See your host’s documentation.
`[E1]`	Prepend `echo:` to the message. Some hosts will display echo messages differently when preceded by `echo:`.
`[Pn<0\|1\|2>]`	Send message to host serial port (1-9). `Pn0`: Send message to all ports. `Pn1`: Send message to main host serial port. `Pn2`: Send message to secondary host serial port. Requires `SERIAL_PORT_2`.
`[string]`	Message string. If omitted, a blank line will be sent.

Echo “Yello World!” in the console

M118 E1 Yello World!

Tell OctoPrint to cancel the print job

M118 A1 action:cancel