Hello,
I am a 15+ years old coder/outsourcer with experience in embedded systems. I can create for you that TCP/IP to Serial interface either on windows, android or linux systems. I've checked your board and those three systems are supported, if you're not going to host more than the flash application, I can say having a development on windows or linux could be easier and less complex for installation and maintenace, but any of those three OS are easy for me.
You need to let me know if you just require a service or you'll also need an alarm system to wakeup the device, as if the device put the intents to sleep, sooner or later the intent will stop working and you'll end with a broke channel connection.
keep me posted, I am available to discuss your project needs without obbligation at all, if you finally agree on timeline, deployment and budget, we move on and I'll put hands on work
cheers
alex