The original way of interacting with OpenTSDB was through a Telnet style API. A user or application simply had to open a socket to the TSD and start sending ASCII string commands and expect a response. This documentation lists the various commands provided by OpenTSDB.
Each command must be sent as a series of strings with a new line character terminating the request.
Connections will be closed after a period of inactivity, typically 5 minutes.
If a command is sent to the API that is not supported or recognized, a response similar to the following will be shown:
unknown command: nosuchcommand. Try `help'.
At any time the connection can be closed by issuing the