We've built a sync-enabled database, and even at 500 kb it's getting a lot of uptake in IoT applications.
Open source databases: http://developer.couchbase.com/mobile
Info about how GE is using it: http://www.couchbase.com/nosql-resources/presentations/offli...
Long story short: when you get the network stuff figured out, it's gonna be an interesting product.
Feel free to contact me (info in profile) if you want to chat about how this can fit into the industry.