ESP32 with Ethernet and MQTT [SOLVED]

Projects Networking, Protocols, and Devices
1

SOLVED For those who come after me....

WiFiClient espClient;
PubSubClient mqttClient(espClient);

ORIGINAL QUESTION
I got my hands on an Olimex ESP32-EVB board with ethernet. Fantastic board. I'm just having a bit of a hard time understanding the ethernet library.

When I connect to the pubsubclient with ESP32/ESP8266 wifi, I will do something like this towards the top of the sketch...

WiFiClient ethClient;
PubSubClient client(ethClient);

If I'm using something like a 5100 shield on an uno/mega (which uses <Ethernet.h>), I would do

EthernetClient ethClient;
PubSubClient client(ethClient);

However, the ESP32 uses <ETH.h> and I cannot for the life of me figure out how to define that client so I can use it with the pubsubclient. I see examples like

ETH.setHostname("esp32-ethernet");

or

WiFiClient client;  //which still seems to refer to ethernet in this context

(See example sketch ESP32-POE/ESP32_PoE_Ethernet_Arduino.ino at master · OLIMEX/ESP32-POE · GitHub)

However anytime I use something like WiFiClient client; with ETH.h, it freaks out if I'm using it outside of a function.

Can someone point me in the right direction. Obviously I'm over my head on this one. Thanks in advance.

2

As the Olimex board uses the LAN8710A PHY you should be able to use the ETH_LAN8720.ino example that comes with the ESP32 WiFi library.

3

pylon:
As the Olimex board uses the LAN8710A PHY you should be able to use the ETH_LAN8720.ino example that comes with the ESP32 WiFi library.

I did look at that and I don't have any problem connecting it to the internet, it just didn't work with MQTT. I do have an answer that I'll post.

4

pylon:
As the Olimex board uses the LAN8710A PHY you should be able to use the ETH_LAN8720.ino example that comes with the ESP32 WiFi library.

Thanks for responding though. This one had me stumped.