Add IsAlive() method on client

emlid/client.go

@@ -78,6 +78,14 @@ func (c *Client) Close() {
 	c.conn = nil
 }
 
+func (c *Client) IsAlive() bool {
+	if c.conn == nil {
+		return false
+	}
+
+	return c.conn.IsAlive()
+}
+
 // Emit a new event with the given data
 func (c *Client) Emit(event string, data interface{}) error {
 	// enc := json.NewEncoder(os.Stdout)