https://www.chitusystems.com/2020/11/03/how-to-activate-the-wifi-module-function-on-your-3d-printer/
For the H and the R follow the instructions for the esp-01 and use sku 030197 to get going!
For the ld-006 follow the instructions for ethernet!
(though all the motherboards have slots on them you can solder an ethernet jack too, this is a bit of an advanced mod however)
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