You may use torch tool to capture traffic
Also you should use ping tool from mk and send ping from local bridge interface.

Hello, everyone!  I have a similar problem. My tv (Samsung J5300) gets ip address but every 20 minutes "tv freezes" and shows a alert "network issue". It's lost connection just for a few seconds, and everything works ok for another 20 minutes.  I tried a lot of things and what i ...

I found solution and now iOS openvpn client v. (1.0.4 build 140) connects to mikrotik routeros v 6.18.
IOS settings->openvpn->advanced settings->Force AES-CBC ciphersuites (disabled this option).

Thanks a lot, you saved me!