A lot of making goes on in this community these days, but sometimes you’ve just gotta do some old fashioned hacking. You might have grabbed an old Speak and Spell that you want to repurpose ...

Using TCP or RS485 shields, like the MKR 485 Shield. This library depends on the ArduinoRS485 library. This library is based on libmodbus, modifications were made to the lower level RS485 and TCP ...