Method for wireless transmission of time-critical data, in particular alarm data, from a battery-operated meter, preferably a consumption meter, to a preferably likewise battery-operated wireless communication module in a short-range wireless standard, in which the meter and the wireless communication module act as master or slave, or vice versa, wherein meter and wireless communication module have been coupled in advance, wherein meter data is sent from the meter to the wireless communication module via a wireless communication link, wherein the meter data differs from the time-critical data, wherein for the purpose of sending the meter data and time-critical data from the meter to the wireless communication module, an active link is established between meter and wireless communication module, wherein first advertising events are sent in order to initiate establishing communication for the purpose of transmitting the meter data, and second advertising events are sent in order to initiate establishing communication for the purpose of transmitting the time-critical data, characterized in that the wireless communication module acts as slave, the second advertising events are sent out by the wireless communication module as slave, and, when a time-critical incident occurs, the meter as master starts to scan for the second advertising events in order to establish a wireless communication link between meter and wireless communication module, or the wireless communication module acts as slave, a role swap between meter and wireless communication module takes place for the purpose of establishing the wireless communication link for transmitting time-critical data, during which role swap the wireless communication module as master scans for the second advertising events, and, when a time-critical incident occurs at the meter, second advertising events are sent out in order to establish a wireless communication link between meter and wireless communication module. wherein meter and wireless communication module have been coupled in advance, wherein meter data is sent from the meter to the wireless communication module via a wireless communication link, wherein the meter data differs from the time-critical data, wherein for the purpose of sending the meter data and time-critical data from the meter to the wireless communication module, an active link is established between meter and wireless communication module, wherein first advertising events are sent in order to initiate establishing communication for the purpose of transmitting the meter data, and second advertising events are sent in order to initiate establishing communication for the purpose of transmitting the time-critical data, the wireless communication module acts as slave, the second advertising events are sent out by the wireless communication module as slave, and, when a time-critical incident occurs, the meter as master starts to scan for the second advertising events in order to establish a wireless communication link between meter and wireless communication module, or the wireless communication module acts as slave, a role swap between meter and wireless communication module takes place for the purpose of establishing the wireless communication link for transmitting time-critical data, during which role swap the wireless communication module as master scans for the second advertising events, and, when a time-critical incident occurs at the meter, second advertising events are sent out in order to establish a wireless communication link between meter and wireless communication module.