How the player hear coach's message

Hi, folks! I want to send messages from the coach to all the players. I read the coach’s section of the manual and saw that exists a method called dosayfreeform to send messages from the coach and I understood that it sends messages to the players, but I couldn’t find how the players listen to messages in the manual. Thanks!

Players receive messages from the coach as aural sensor information.
Please see the section 4.3.1. Aural Sensor Model
https://rcsoccersim.readthedocs.io/en/latest/soccerserver.html#aural-sensor-model
If coaches send a message, players will receive a hear message with the sender name ‘online_coach_{left,right}’.

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