Ssl – Which openvpn cipher should I use

You have port 1937 specified in your client configuration, but port 1194 specified for the server to listen on in your server config. Having said that, your server log shows that it's listening on port 1937, at least at the time that you took that log. Other than that, nothing looks amiss to me.

It sure looks like you're getting good TCP connections between the client and the server. To rule out any PKI issues, I'd start with a static key configuration and, once that works, move on to a public key configuration.

I do this on my home Wifi, because I don't trust WEP/WPA. The relevant setting on my OpenVPN server is:

push "route 0.0.0.0 0.0.0.0"

That tells the client "I want you to route all your traffic through me". From there, I can deal with the traffic on the server as I would any other traffic that I need to route.

The only caveat is that you need to remove or deprioritise the default route that the DHCP server might send (if you're using dynamic config); I just have a post-up rule in /e/n/interfaces that deletes the default route that the DHCP server sends, since it's useless anyway, but you could also configure your DHCP server not to send it at all (I used to use dnsmasq, which got shirty if it couldn't send a default route, hence my hack; now I've run away from it, I should probably reconfigure ISC DHCP to do the right thing and not send the default route at all).