Connection system and awning structure with connection system

An awning system, comprising:

• an awning, comprising:
• a roller tube;
• and
• an accessory element coupled to the roller tube;
• and
• a connection system for connecting the awning to a mounting structure, the connection system comprising:
• a receiving member coupled to the mounting structure and defining a receiving groove extending along an extension path;
• and
• an adapter comprising an engaging section configured to engage the receiving groove by at least a translatory movement in a direction substantially perpendicular to the extension path and a receiving section coupled to the awning,
• wherein a normal force between a contact area of the engaging section and the receiving groove increases when the engaging section rotates in one direction about the extension path such that the adapter is in a self-locked condition within the receiving groove.