128 KB is the maximum message Watson IoT Platform can send.
Yes, you can use the Watson IoT Platform for free as long as your data usage is within the free quota. We do not have a minimum charge. Watson IoT Platform works great for all data usage scenarios because you only pay what you use.
If you only use 100 MB for each of data exchanged, data analyzed and data analyzed edge, then you will not need to pay for anything.
In the end of the month, the Watson IoT Platform will calculate the usage and use the right tier for you. Daily data fluctuation will not affect your billing and performance.
Leave your daily data fluctuation to Watson IoT Platform. We will make sure all your messages are received and delivered, so that you can focus on the application development.
There is no capacity limit for each tier. Your service will not be interrupted by data usage fluctuation or tier change.
For example, if the total data you exchanged this month increases from 1 MB to 744,000 MB, the monthly pricing will automatically be adjusted to Tier 2. The price will be [744,000MB – 100MB (free tier) ]* 0.0007 = $521
You do not need to do anything, and your messages will be delivered and received without delays.