The NodeMCUs in the HiveScientia system rely on WiFi to transmit their signal to the receiving MQTT server. Depending on the distances involved you may need to provide an external WiFi access point.
If you have a good quality home router and/or good line of sight to the NodeMCU you might be able to use your home WiFi connection. The easiest way to test this is connecting your phone or device to the WiFi network and walking around outside and watching for it to drop off and lose the connection.
Bear in mind the stronger the connection the more reliable its going to be. Weather conditions and obstacles that come and go (cars) will all affect the strength of the signal.