This action adds one byte to the end of the current binary message.

It takes one sting parameter, which should have the character you want to add.


This action is designed for a single ASCII character only. You should only put one character in the string, e.g. "c".


If you want to add multiple text characters at once, use one of the Binary to send > Add string actions instead.

If you put multiple characters using this action, Relay will quietly add the first one in the text, and Blue will create an error.


In Blue Unicode, if you want to send a single character/code point but it is not ASCII, you can add it using the Binary to send > Add string > Without null terminator, and read it back with Text With Size expression instead, passing size 1.