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Welcome to the esp-rfid wiki! this is not the offitial esp-rfid wiki, it is more or less a faq for me and could help you as well.

To use MQTT to trigger the relay you have to send a JSON string including the IP of the ESP-RFID. To test it you can try mosquitto_pub on linux:

mosquitto_pub -h Your.MQTT.Broker.IP -t testrfid -m '{"doorip":"192.168.xxx.xxx","cmd":"opendoor"}'

To get a list of users from the ESP-RFID:

1. start listening for mqtt messages with the topic YOUR-ESP-RFID-Topic/send example:

mosquitto_sub -h MQTT.Broker.IP -t testrfid/send

2. send a message to the ESP-RFID including its IP:

mosquitto_pub -h MQTT.Broker.IP -t testrfid -m '{"doorip":"192.168.xxx.xxx","cmd":"listusr"}'

in the listening window you'll get the answer to the request:

{"command":"userfile","uid":"123456756","user":"Inge","acctype":1,"validuntil":2145916800}