How to make a repeater on OpenWRT?

Question

Computer networks

There is such a grid:
Clients))) (((OpenWRT))) (((Mikrotik
((( is wifi.
Mikrotik distributes wifi, but it does not reach the clients. Between them is a router with OpenWRT, which needs to be configured as a repeater.
To Mikrotik is connected to a recording device for ip cameras via cable, and the cameras themselves are clients in the network segment of the same name.At the same time, it is important that the recording device sees all the cameras and their ip directly, so that Mikrotik's dhcp gives out addresses.That is, nat on openwrt is not applicable.
PS If there is such an opportunity in other alternative firmware, then tell

Answer 1

OpenWRT has a ready manual .
PS It shows a wired connection on one side, but you can also raise it as an access point, it doesn't matter, but the ability to simultaneously use a wireless client connection and be an access point is determined by the WiFi adapter chipset and driver. If there is such an opportunity, then this is done in LUCI with the "Add" button in the Wifi settings, and the appropriate mode is added (client or access point).