Blynk.config vs Blynk.connect

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Then just look at one of the constructors in BlynkEthernet.h:

void begin( const char* auth,
                const char* domain = BLYNK_DEFAULT_DOMAIN,
                uint16_t port      = BLYNK_DEFAULT_PORT,
                const byte mac[]   = NULL)
    {
        BLYNK_LOG1(BLYNK_F("Getting IP..."));
        if (!Ethernet.begin(SelectMacAddress(auth, mac))) {
            BLYNK_FATAL(BLYNK_F("DHCP Failed!"));
        }
        // give the Ethernet shield a second to initialize:
        BlynkDelay(1000);
        IPAddress myip = Ethernet.localIP();
        BLYNK_LOG_IP("IP:", myip);

        config(auth, domain, port);
        while(this->connect() != true) {}
    }
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