Function to generate a random MQTT client ID with a common prefix

generate_mqtt_client_id.go

import 	CRAND "crypto/rand"

// GenMQTTClientID generates a random client id for mqtt
func GenMQTTClientID(prefix string) (string, error) {
	r, err := CRAND.Int(CRAND.Reader, new(big.Int).SetInt64(100000))
	if err != nil {
		return "", fmt.Errorf("Failed to generate MQTT client ID: %v", err)
	}
	return prefix + r.String(), nil
}