client.go

package main

import (
	"context"
	"fmt"
	"log"
	"time"

	"google.golang.org/grpc"
	"google.golang.org/grpc/credentials/insecure"
)

func main() {
	conn, err := grpc.DialContext(context.Background(), "localhost:50051", grpc.WithTransportCredentials(insecure.NewCredentials()))
	if err != nil {
		log.Fatal(err)
	}
	defer conn.Close()

	exp := time.After(50 * time.Second)
	ticker := time.NewTicker(1 * time.Second)
	for {
		select {
		case <-exp:
			ticker.Stop()
			return
		case <-ticker.C:
			fmt.Printf("Connection status: %s\n", conn.GetState().String())
		}
	}
}

server.go

package main

import (
	"log"
	"net"

	"google.golang.org/grpc"
)

func main() {
	lis, err := net.Listen("tcp", ":50051")
	if err != nil {
		log.Fatalf("failed to listen: %v", err)
	}
	s := grpc.NewServer()
	s.Serve(lis)
}