I have developed a CC2652P+ESP12 hardware design which is compatible with the zigbee2mqtt zstack 3.x firmware. It uses SMA antenna so that you can use a 6dbi stick antenna. If your server doesn’t have usb-to-serial driver, it will be the simplest ZigBee coordinator solution for you. Hope you like it 
GitHub - cyijun/OpenZ3Gateway: An open source Zstack3 gateway powered by ESP8266 and CC2652 modules