On the picture: The porch, on the north side of the mosque, where the entrance to the congregation hall is.
The presence of a secondary ‘mihrab’ (prayer niche) indicates this is also the ‘son cemaat yeri’ (= ‘area for those who came late’), where worshippers who reached the mosque late or at the last moment, will gather and fulfil their prayer duty.
The wooden racks along the wall are shoe racks: as worshippers and visitors at a mosque must take off their shoes before entering, you will always find them close to the entrance. The risk that your shoes turn up missing after your visit is close to none, except maybe in some Istanbul mosques (but there, watch is being organised if necessary).

Correspondent: J.M.Criel, Antwerpen.
Source: ‘Vakıf Abideler ve eski Eserler’ - Vakıflar Genel Müdürlüğü III, Ankara 1983 .