How to update a text file dynamically

Question

I have Two Arduinos, One with the help of sensors it will dynamically updates in to my server database. Other Arduino, reads the stored contents from the server database and sends sms to phones.

Now, I have a text file in my server which updates dynamically for every 5 min - 10 min. I am trying to read that text file contents.

I want my server to be always connected, So It must be in setup() function. I want update only to my text file which dynamically changes, so it must be loop() function.

How to implement this ? Any Suggestion ?

• Anonymous Penguin: Does the content change via web interface or with a sensor/other function on the Arduino?
• Ignacio Vazquez-Abrams: Is the Arduino the server or the client?
• Manihatty: I have Two Arduinos, One with the help of sensors it will dynamically updates in to my server database. Other Arduino, reads the stored contents from the server database and sends sms to phones.
• Peter Bloomfield: Is your server actually running on an Arduino?
• Manihatty: I want the server connection in setup() and In loop() I want to updated only current content in the text file. How to update the client.print("GET /current.txt"); dynamically in loop()

Answer 1

It's difficult to answer without details of how your server works.

If your arduino is simply connected to the server, the server could open the arduino serial port (e.g.: COM5: or /dev/ttyUSB0) and simply read data. The arduino would only need to serialWrite() data for the server to parse and store.

If your arduino is not connected but has ethernet support you could do a HTTP request to your server, and pass the data as a parameters to the request, e.g.:

http://your.server.ip/send_data?param1=10.3&param2=5.6&param3=foo

When your server processes this HTTP request, it appends param1, param2, param3 to that text file.

The arduino could also beam data back to your server via IR, or bluetooth, etc.

There's lots of ways to do this.