Changes to Python script + linux processes + Raspberry pi

I have a python script running at startup in Raspberry pi, OS is Linux without UI. The Raspberry pi is currently connected to an Arduino via Serial pins (RX,TX), and it's receiving serial data, processing it and then uploading it to a server using an Internet connection. In detail: There are some arduinos monitoring temperature, humidity, etc. they send those variables in a single line string to the Arduino connected to the Raspberry pi wirelessly via RF, then that Arduino pass the same string to the Raspberry pi using the Serial communication via RX and TX pins. The python script running in the Raspberry pi listen for incoming serial data, when a string is received it's checked, processed, and then uploaded to a server (Internet) using Tornado library so it can upload multiple data (Asynchronous). It's quite simple, the script is running perfectly. What I need to add now is: - There will be a new type of sensor that when start will send it's ID to the Rpi (passing through the arduino of course) the Rpi should store it (sqlite) and confirm, when confirmation is send back to the sensor it will start working normally. - The Python script will periodically send a request to a web service, including the list of sensor's ID's stored via JSON (I'll provide the format), if there is any data available at that moment the web service will respond back with some commands that must be sent to the sensors. The response must be checked to ensure data integrity. If response is OK, the received commands will be sent to the sensors, the sensors will confirm back if those commands were executed, when Rpi receive the confirmation, then it will send an ACK to the webservice indicating that those commands were succesfully executed. That's it. There are some minor details about the whole process but I already explained 99% of the project with the text above so it's a simple project.