how to make managed and master AP to talk to each other

Hi Guys,

I have a peculiar problem and i tried my best to figure out problem but i am unable to do so.

Problem -> I Have two devices with access -point n both of them say router A and device B that test connectivity and functionality of Device A.

I have turned access-point of B into managed mode so that it accepts connection from Router A. everything works fine and it connects to router A and i get correct ssid of router A.

Now my text task is to measure speed or transfer some files. When i ping from B to A or vice versa it failed . I am unable to find the problem. IN B wlan0 is connected and has ip address of 192.168.200 and subnet mask of 255.255.255.248 and external ip address of say something like 10.50.120.10

A has wlan3 is connected has ip address in range 192.168.2.1 and subnet mask of 255.255.255.255

Could you guys please let me know who would i make them talk to each other Thanks and regards, Sam