Some example code for Network interface

[CelliesProjects]

Related area

Network

Hardware specification

All esp32

Is your feature request related to a problem?

I would like to see some examples for https://github.com/espressif/arduino-esp32/tree/master/libraries/Network

Describe the solution you'd like

Looking at the code I can figure out some stuff, but a couple of examples would be nice.

Describe alternatives you've considered

No response

Additional context

No response

I have checked existing list of Feature requests and the Contribution Guide

• I confirm I have checked existing list of Feature requests and Contribution Guide.

[me-no-dev]

WiFi.STA, WiFi.AP, ETH and PPP all implement the NetworkInterface class. It's the glue between Arduino and LwIP. It's not really usable on it's own. One thing that can be called is the NetworkManager to let's say attach an event listener (because it implements the NetworkEvents) or set the default outgoing interface (STA, ETH or PPP)

[CelliesProjects]

@me-no-dev Thanks for the explanation!

I was reading tah network code because of this code that does not compile since 3.0.x:

inline __attribute__((always_inline)) bool
ESP32_VS1053_Stream::_networkIsActive()
{
    for (int i = TCPIP_ADAPTER_IF_STA; i < TCPIP_ADAPTER_IF_MAX; i++)
        if (tcpip_adapter_is_netif_up((tcpip_adapter_if_t)i))
            return true;
    return false;
}

How would I do this with 3.x.x?

For now I changed this to something like return WiFi.isConnected() but I would like to be able to check all the interfaces.

[me-no-dev]

Yes please use our new API. The reason why your code does not work is that tcpip_adapter_* API is no longer present in ESP-IDF. It has been replaced by esp_netif APIs and our new network layer is based on that. You can use bool WiFi.STA.connected();, bool WiFi.AP.connected();, bool ETH.connected(); and bool PPP.connected();

[me-no-dev]

Instead of .connected() you can use .linkUp() if you just want to see if the interface is UP (not necessarily connected)

[CelliesProjects]

After taking another look at NetworkManager i found this inside hostByName()

arduino-esp32/libraries/Network/src/NetworkManager.cpp

Lines 59 to 76 in 2fecc48

	// This should generally check if we have a global address assigned to one of the interfaces.
	// If such address is not assigned, there is no point in trying to get V6 from DNS as we will not be able to reach it.
	bool hasGlobalV6Now = false;
	bool hasGlobalV4Now = false;
	for (int i = 0; i < ESP_NETIF_ID_MAX; ++i) {
	NetworkInterface *iface = getNetifByID((Network_Interface_ID)i);
	if (iface != NULL) {
	if (iface->hasGlobalIPv6()) {
	hasGlobalV6Now = true;
	}
	if (iface->hasIP()) {
	hasGlobalV4Now = true;
	}
	}
	if (hasGlobalV6Now && hasGlobalV4Now) {
	break;
	}
	}

Almost exactly what I need!