GoLang TCP Connection - Remote Network is down check - go

Question

I am creating a GoLang application and clients are android phones. I am able to handle connections. If user closes the android application connection is dropped with EOF
My problem is, if client just turn off wifi network connection is still alive.
Here is my code
func main() {
fmt.Println("Starting server...")
connection, err := net.Listen("tcp", ":4406")
if err != nil {
fmt.Println(err)
}
defer connection.Close()
manager := ClientManager{
clients: make(map[*Client]bool),
broadcast: make(chan []byte),
register: make(chan *Client),
}
go manager.start()
for {
connection, _ := connection.Accept()
if err != nil {
fmt.Println(err)
}
client := &Client{socket: connection, data: make(chan []byte), uuid: connection.RemoteAddr().String()}
manager.register <- client
go manager.receive(client)
go handleConnection(client)
}
}
Handeling connections
func handleConnection(client *Client) {
conn := client.socket
defer conn.Close()
notify := make(chan error)
go func() {
buf := make([]byte, 1024)
for {
n, err := conn.Read(buf)
if err != nil {
notify <- err
return
}
if n > 0 {
fmt.Println("unexpected data: %s", buf[:n])
}
}
}()
for {
select {
case err := <-notify:
if err != nil {
fmt.Println("connection dropped message", err)
return
}
case <-time.After(time.Second * 1):
fmt.Println("timeout 1, still alive")
}
}
}
When remote wifi is off (cable removed) I want to disconnect the user. I tried to read a byte and every second and it is reading it. I sent a byte and it is sent as well.