An analyte monitoring system , comprising: a sensor configured to take measurements indicative of analyte levels; a sensor electronics unit communicatively coupled to the sensor and configured to: receive the measurements indicative of analyte levels, process the received measurements, and transmit data indicative of the analyte levels using a first communication protocol that is Bluetooth or Bluetooth Low Energy, BLE, at predefined times; and a display device configured to send a transmission to the sensor electronics unit utilizing a second communication protocol that is near field communication, NFC, or radio-frequency identification, RFID, to start a sensor session, wherein the sensor electronics unit is configured to start sensor measurements in response to the transmission, wherein the display device is configured to: receive the data indicative of the analyte levels sent by the sensor electronics unit using the first communication protocol, and use the second communication protocol to retrieve data indicative of analyte levels from the sensor electronics unit between the predefined times by sending a command using the second communication protocol to the sensor electronics unit to cause the sensor electronics unit to send data indicative of analyte levels to the display device using the second communication protocol; wherein the sensor electronics unit is further configured to send data indicative of analyte levels to the display device using the second communication protocol in response to the command. a sensor configured to take measurements indicative of analyte levels; a sensor electronics unit communicatively coupled to the sensor and configured to: receive the measurements indicative of analyte levels, process the received measurements, and transmit data indicative of the analyte levels using a first communication protocol that is Bluetooth or Bluetooth Low Energy, BLE, at predefined times; and receive the measurements indicative of analyte levels, process the received measurements, and transmit data indicative of the analyte levels using a first communication protocol that is Bluetooth or Bluetooth Low Energy, BLE, at predefined times; and a display device configured to send a transmission to the sensor electronics unit utilizing a second communication protocol that is near field communication, NFC, or radio-frequency identification, RFID, to start a sensor session, wherein the sensor electronics unit is configured to start sensor measurements in response to the transmission, wherein the display device is configured to: receive the data indicative of the analyte levels sent by the sensor electronics unit using the first communication protocol, and use the second communication protocol to retrieve data indicative of analyte levels from the sensor electronics unit between the predefined times by sending a command using the second communication protocol to the sensor electronics unit to cause the sensor electronics unit to send data indicative of analyte levels to the display device using the second communication protocol; receive the data indicative of the analyte levels sent by the sensor electronics unit using the first communication protocol, and use the second communication protocol to retrieve data indicative of analyte levels from the sensor electronics unit between the predefined times by sending a command using the second communication protocol to the sensor electronics unit to cause the sensor electronics unit to send data indicative of analyte levels to the display device using the second communication protocol; wherein the sensor electronics unit is further configured to send data indicative of analyte levels to the display device using the second communication protocol in response to the command. <EOS>