It is possible to communicate via the UART interface with the NB|DevKit and send user data to the cloud.
Therefore the jumper on the development board needs to be changed as mentioned in the hardware guide. The USB cable is still needed for providing power to the DevKit.
This application note uses an Arduino, but any other device with a UART interface (for example a Raspberry PI) can be used to communicate with the device. Only the logic voltage level has to be adjusted to 3.3 Volts.

Bill of Materials

For this application you need the following pieces:

• DHT11 temperature & humidity sensor
• Arduino Uno
• Vodafone Development Kit
• Exelonix Cloud Account

Steps

Connect DHT11 to Arduino

https://learn.adafruit.com/dht/overview

Connect Arduino to NB|DevKit

• Change jumper on NB|DevKit to use 3.3V UART interface
• Attach wires
•  Add voltage divider to adapt Arduino 5V to 3.3V needed by NB|DevKit

Program Arduino

1. Read sensor values

2. Attach to NB-IoT network

Transmit/Receive the following EASY-Interface message to the DevKit via UART

EASY+Attach:0

// wait till attached to network:
EASY#Attach:Success

3. Transmit data to Exelonix cloud

Payload to be transmitted to Exelonix cloud in Exelonix UDP Protocol format: <IMEI>?b=[s="<payload>"]
Device IMEI can be read via message "EASY+Device"

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