Fig. 1. IoT based monitoring and control system
Fig. 2. Controller and communication modules
Fig. 3. Flowchart of stand-alone solar lamp controller
Fig. 4. Operation flow diagram of IoT gateway
Fig. 5. Graph on the relationship between solar module voltage and battery charging voltage
Fig. 6. Graph on the relationship between solar module current and battery charging current
Fig. 7. Middleware class diagram for IoT gateway operation
Fig. 8. Screen of controller data received
Fig. 9. Screen of stored files(in case of TCP/IP communication connection failure)
Table 1. Development environment for IoT gateway middleware platform
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