tried adding a Ardruino Ethernet Shield v1.1 with the goal of having a networked client upload sensor data to a remote server
trick is that no existing libraries have been working
tried several
GitHub - njh/EtherCard: EtherCard is an IPv4 driver for the ENC28J60 chip, compatible with Arduino IDE
GitHub - turicas/Ethernet_ENC28J60: [NOT MAINTAINED, NOT COMPLETED] Implementation of an Arduino-compatible socket layer library that uses Microchip ENC28J60 Ethernet controller.
The Arduino Ethernet Shield does not use an ENC28J60 chip. It uses a W5100. Why are you trying to use these libraries with that chip?