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c066c7ca6c
When network interface is down, some nasty things happen, for instance tcp_connect returns without ever calling error callback. This change adds some workarounds for that: before doing a tcp connect and DNS resolve we check if there is a route available. Also added a listener for wifi events which stops (aborts) all the WiFiClients and WiFiUDPs when wifi is disconnected. This should help libraries detect disconnect properly.