What does short report mean?

Short message communication uses Morse signal code for wireless telegraph communication. The Poseidon signal is a set of codes with different lengths representing letters and numbers. Long signals are represented by dashes, and short signals are represented by dots. . Then use a launch button to launch.

When the signal is long, the button is on for a long time; when the signal is short, the button is on for a short time. The receiving direction converts the received signal into a sound signal, relies on hearing to record the combination of long and short signals, and then translates it into a message. To put it simply, "short message" is equivalent to the "short message" commonly used by people. Short message can publish information of 140 words, and can locate the location of the publisher.