+
+## Configuring the Terminal
+
+Send SMS to the telephone number of the SIM card plugged in the terminal,
+with the text
+
+* for zx303:
+ ```
+ server#<your_server_address>#<port>#
+ ```
+* for D99:
+ ```
+ pw,123456,ip,<your_server_address>,<port>#
+ ```
+
+"123456" is the default password on that kind of trackers, that you can
+change. If "123456" does not work, try "523681".
+
+Server address may be FQDN or a literal IP address. Port is a number;
+by default, this application listens on the port 4303. A different
+port can be configured in the config file.
+
+It is recommended to always keep the service running while the terminal
+is powered up: it is possible that the terminal is programmed to reset
+itself to the default configuration if it cannot connect to the server
+for prolonged time.