Thanks Dave! I originally had the BeagelBone planned but I accidentally blew it up: BeagleBone IOs are not 230V AC tolerant ;-)
Good point about the speed, let me give some more details:
* Webserver will be used to configure the sensor and check status. no more than 2 sessions will be open at any time.
* Sensor reads are asynchron. at most 100 readings per second. normal operation 5 reading per second. Time to database is not critical. if it takes 20 seconds no one will care/notice. Jitter is not an issue either.
* Sensor read/write and data processing is done on a 16bit MSP430 and right now transmitted via UART. We just want to switch to ethernet and a single MCU design for production.
* I would like to use the native MySQL connector and avoid writing my own one. I am afraid that setting up the database would become a support nightmare otherwise.
I feel like the T4C129 would be a nice fit. I am just afraid of starting from scratch and face a skyrocketing the development time.