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