1) The document discusses various Internet of Things (IoT) based digital agriculture monitoring systems that have been developed by researchers to optimize resource utilization and increase crop production.
2) It describes different technologies like Bluetooth, Zigbee, GSM, WiFi that have been used to monitor agriculture parameters such as temperature, moisture, humidity and communicate this sensor data to monitoring systems.
3) The paper also proposes a new IoT monitoring system using sensors to measure temperature, soil moisture and humidity, an ESP8266 WiFi module to transmit data to the cloud, and a user interface to view environmental parameter graphs remotely.