Explanation :
100 KB * 24 is around 2,400 bytes. The 100 KB message is divided into 4 KB blocks, and it is billed for 25 messages. 25 times 24 is 600. Note: The maximum message size for messages sent from a device to the cloud is 256 KB. These messages are metered in 4 KB blocks for the paid tiers so for instance if the device sends a 16 KB message via the paid tiers it will be billed as 4 messages
