The MG3 is a new mini USB Bluetooth-WiFi gateway.
It’s a more affordable version of the G1 with slightly less capability:
The MG3 collects advertising data from all Bluetooth LE devices and then sends JSON data to your server by HTTP(S) or MQTT using WiFi.
The MG3 processes up to 70 Bluetooth devices per second. The maximum range is 70 meters in open space but this depends more on the range of beacons being detected.
Configurable data collection settings include the upload method (HTTP(S) or MQTT), server URL, upload interval, RSSI filter, MAC address filter (RegEx), raw Bluetooth filter (RegEx) and the time zone.