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/*
Write to file using FileIO classes.
This sketch demonstrate how to write file into the Yún filesystem.
A shell script file is created in /tmp, and it is executed afterwards.
created 7 June 2010
by Cristian Maglie
*/
#include <FileIO.h>
void setup() {
// Setup Bridge (needed every time we communicate with the Arduino Yún)
Bridge.begin();
// Initialize the Serial
Serial.begin(9600);
while(!Serial); // wait for Serial port to connect.
Serial.println("File Write Script example\n\n");
// Setup File IO
FileSystem.begin();
// Upload script used to gain network statistics
uploadScript();
}
void loop() {
// Run stats script every 5 secs.
runScript();
delay(5000);
}
// this function creates a file into the linux processor that contains a shell script
// to check the network traffic of the WiFi interface
void uploadScript() {
// Write our shell script in /tmp
// Using /tmp stores the script in RAM this way we can preserve
// the limited amount of FLASH erase/write cycles
File script = FileSystem.open("/tmp/wlan-stats.sh", FILE_WRITE);
// Shell script header
script.print("#!/bin/sh\n");
// shell commands:
// ifconfig: is a command line utility for controlling the network interfaces.
// wlan0 is the interface we want to query
// grep: search inside the output of the ifconfig command the "RX bytes" keyword
// and extract the line that contains it
script.print("ifconfig wlan0 | grep 'RX bytes'\n");
script.close(); // close the file
// Make the script executable
Process chmod;
chmod.begin("chmod"); // chmod: change mode
chmod.addParameter("+x"); // x stays for executable
chmod.addParameter("/tmp/wlan-stats.sh"); // path to the file to make it executable
chmod.run();
}
// this function run the script and read the output data
void runScript() {
// Run the script and show results on the Serial
Process myscript;
myscript.begin("/tmp/wlan-stats.sh");
myscript.run();
String output = "";
// read the output of the script
while (myscript.available()) {
output += (char)myscript.read();
}
// remove the blank spaces at the beginning and the ending of the string
output.trim();
Serial.println(output);
Serial.flush();
}
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