Low Power Wide Area Networks (lpwan): Technology Review And Experimental Study on Mobility Effect

CONDUCTOR-DATA PLATFORM

It is a proprietary cloud based service application developed by LinkLabs. It provides the network management and data services for the Symphony Link protocol. It also provides a very dynamic data infrastructure which makes building a Symphony link application as easy as making a connection with an API. Although it can be deployed in any server farm, it is currently being deployed inside Amazon Web Services. Conductor also manages the settings for Symphony Link network, database storage, message routing, certificates, sessions and security infrastructure.

5. PRELUDE

Prelude is a graphical interface application developed by LinkLabs to register the nodes to the gateway and to establish communication between the host micro-controller and the end node. It also shows the current status of IRQ flags as the change while the end not communicates with the gateway. Since this application runs on the host computer all the functions that can be performed by this application can also be performed by using high level command line functions from host terminal. Figure 22 shows the view of prelude running on host computer.

Figure 22: Prelude symphony link application.

6. LESSONS LEARNED

The following lessons were learned while implementing the LPWAN network using
Symphony Link protocol:

• 
  It is important to check the hardware for faults before implementing the communication code. Using the GUI application Prelude helped us to identify faulty antennas and modules before implementing the communication code. We learned this the hard way as first attempted to implement the software code assuming that there were no issues with the LoRa modules only to find out later that they were faulty.
  
• 
  In the current code implementation, every time the module disconnects from the gateway, it resets the network statistics to the values of the new connection and the next message send is marked as the first message. Due to this issue, we had to conduct a set of experiments again if the module disconnects before it finishes the data transmission. This issue was noticed at the time we started conducting the experiments and hence it can be an issue that can be fixed in future implementations.
  

5.