Method for wireless transmission of time-critical data, in particular alarm data, from a battery-operated meter

A method for wireless transmission of time-critical data from a battery-operated meter to a wireless communication module in a short-range wireless standard, the meter and the wireless communication module acting as master and slave or slave and master, the method comprising the following steps:

• providing a meter and a wireless communication module being coupled in advance;
• sending meter data from the meter to the wireless communication module over a wireless communication link;
• the meter data differing from the time-critical data;
• establishing an active link between the meter and the wireless communication module for sending the meter data and the time-critical data from the meter to the wireless communication module;
• sending first advertising events to initiate establishing communication for transmitting the meter data;
• sending second advertising events to initiate establishing communication for transmitting the time-critical data;
• and
• causing the wireless communication module to act as the slave, using the wireless communication module as the slave to send out the second advertising events and upon an occurrence of a time-critical incident, using the meter as the master to start to scan for the second advertising events to establish the wireless communication link between the meter and the wireless communication module.