0.2.1

• Fix get_state for unkown command

• Add ONVIF_event_callback method

• Add flv protocol stream

• Add visitor_detected method

• Add host setting commands to get_state

• Add username and user_level properties

• Improve ai_supported property

• Simplify ai_detected method

• Improve motion detection state

• Improve logging

• Remove unneeded setters

Full Changelog: 0.2.0...0.2.1