package main

import (
	"flag"
	"fmt"
)

func runEchoPing(sp *serialPort, args []string) error {
	fs := flag.NewFlagSet("echo-ping", flag.ExitOnError)
	clientID := fs.Uint("client", 0, "slave client id from `clients`")
	if err := fs.Parse(args); err != nil {
		return err
	}
	if *clientID == 0 {
		return fmt.Errorf("client id required (see `gotool clients`)")
	}

	r, err := sp.echoPing(uint32(*clientID))
	if err != nil {
		return err
	}

	fmt.Printf("echo ping: success=%v client_id=%d rtt_ms=%.3f esp_rtt_us=%d\n",
		r.Success, r.ClientID, r.RttMs, r.EspRttUs)
	return nil
}