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I've got brand new switches, they've changed the scheme a bit, it's now Ver.2.0. Most notably the relay module is now HKE V6-S-DC5V. And it's impossible to flash supla firmware now, looks like the AP mode was changed or gone, NODEMCU doesn't catch the AP MAC. eWelink works fine though
You connect it that way TX----->RX and RX------>TX
Każde urządzenie elektryczne działa o wiele lepiej jeśli podłączysz je do prądu.