I have a CC2531 connected via USB to my server to read/control some Zigbee devices. I use the version with external antenna.
I found that the location of the server is not optimal and I would like to move the sniffer to another place (near the wifi router), where I don't have a USB connection to the server available. The router cannot run OpenWRT so I cannot connect the CC2531 to the router and expect it to work.
Adding a ES8266 to obtain a TCP-serial port would be a good solution, such as described in Zigbee2MQTT bridge however those instructions expect a CC2530, identical to CC2531 except for the lacking USB interface.
How to connect ESP8266 directly to CC2531 via serial?