Hubitat allows for opening and maintaining a connection to a telnet endpoint from the hub. All code needs to be contained in a driver; there is no option to open a telnet connection from an app. Hubitat provides methods to connect and disconnect to the endpoint. In addition, it is required to create a method in the driver that accepts incoming messages (parse) and another method that will be called with any status updates for the endpoint (telnetStatus).
void telnetConnect(Map options, String ip, int port, String username, String password)void telnetConnect(String ip, int port, String username, String password)ip - The IP Address of the endpoint you want to connect to
port - The port number of the endpoint, typically 23 for telnet interfaces
username - The username to use to log in, pass null if no username is required
password - The password to use to log in, pass null if no password is required
options - The options to use when connecting to the telnet interface.
void telnetClose()
Methods with the following signatures must be provided in your code and will be called as described.
parse(String message) - This method is called with any incoming messages from the telnet endpoint. This is a standard method for drivers.telnetStatus(String message) - This method is called with any status messages from the telnet connection (disconnections, errors during connect, etc)