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The instances of asynrole.agent class have the following methods:
Attempt to send request data item rsp (string) to remote server by either dst address (given in socket module notation), if specified, or default destination whenever given on asynrole.agent class instaniation.
The callback function, as specified on agent class instanitation, will be invoked on response arrival or error.
Objects of asynrole.agent class have no public instance variables.