create a new macro that will listen for an email, or a SMS text searching for a specific phrase.
let's assume it is a text message "Settonormal" is the phrase.
MacroDroid will listen to all incoming SMS messages and when it sees a 'specific phrase' it will invoke the rest of the macro to do whatever you tell it to do.
I have created a special contact in my Contacts called "Me." yes, there is a period there. stops searches from including all names with the characters 'me'
Now, unlock your phone, open SMS app, send a message to yourself from that SMS conversation with that single phrase. next time all you do is hold down on the previous 'sent message' and select "copy text".
then you just Hold down on new message and 'paste the text', 2 seconds later, MacroDroid sees that incoming message and performs your macro.
I do this almost every day