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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.
*/
#include <FileIO.h>
void setup() {
// Setup Bridge (needed every time we communicate with the Arduino Yún)
Bridge.begin();
// Setup Console
Console.begin();
// Buffering improves Console performance, but we must remember to
// finish sending using the Console.flush() command.
Console.buffer(64);
// Setup File IO
SD.begin();
// Upload script used to gain network statistics
uploadScript();
}
void loop() {
// Run stats script every 5 secs.
runScript();
delay(5000);
}
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 = SD.open("/tmp/wlan-stats.sh", FILE_WRITE);
script.print("#!/bin/sh\n");
script.print("ifconfig wlan0 | grep \"RX bytes\" | tr ':' ' ' | awk \"{ print \\$3 \\\" \\\" \\$8 }\"\n");
script.close();
// Make the script executable
Process chmod;
chmod.begin("chmod");
chmod.addParameter("+x");
chmod.addParameter("/tmp/wlan-stats.sh");
chmod.run();
}
void runScript() {
// Launch script and show results on the console
Process myscript;
myscript.begin("/tmp/wlan-stats.sh");
myscript.run();
Console.print("WiFi RX/TX bytes: ");
while (myscript.available()) {
char c = myscript.read();
Console.print(c);
}
Console.println();
Console.flush();
}
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