Before anything else you should verify a connection (any kind) between both peers. It looks to me that you are having network problems at the routing level, firewall, etc.
I can't guess what IP address you are using but if it's a local private network address (usually 192.168.x.x; 172.16-31.x.x; 10.x.x.x) or a modem/router address, you should start to check out how to configure the router of the network where the server is located to start accepting connections from outside, either by using port-forwarding, DMZ or whatever.
If this is not the problem, then we'll need more details. But first you should test connecting to your MySQL server within the same network.
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