Arduino Yún File Write Script

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1void setup() {
2
3  Bridge.begin();
4
5  Serial.begin(9600);
6
7  while(!Serial);  // wait for Serial port to connect.
8
9  Serial.println("File Write Script example\n\n");
10
11  FileSystem.begin();
12
13  uploadScript();
14}

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1void loop() {
2
3  runScript();
4
5  delay(5000);
6}

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1void uploadScript() {
2
3  File script = FileSystem.open("/tmp/wlan-stats.sh", FILE_WRITE);

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1script.print("#!/bin/sh\n");
2
3  script.print("ifconfig wlan0 | grep 'RX bytes'\n");
4
5  script.close();  // close the file

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1Process chmod;
2
3  chmod.begin("chmod");      // chmod: change mode
4
5  chmod.addParameter("+x");  // x stays for executable
6
7  chmod.addParameter("/tmp/wlan-stats.sh");
8
9  chmod.run();
10}

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1void runScript() {
2
3  Process myscript;
4
5  myscript.begin("/tmp/wlan-stats.sh");
6
7  myscript.run();

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1String output = "";
2
3  while (myscript.available()) {
4
5    output += (char)myscript.read();
6
7  }

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1output.trim();
2
3  Serial.println(output);
4
5  Serial.flush();
6}

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1/*
2
3  Write to file using FileIO classes.
4
5 This sketch demonstrate how to write file into the YunShield/Yún filesystem.
6
7 A shell script file is created in /tmp, and it is executed afterwards.
8
9 created 7 June 2010
10
11 by Cristian Maglie
12
13 This example code is in the public domain.
14
15 http://www.arduino.cc/en/Tutorial/FileWriteScript
16
17 */
18
19#include <FileIO.h>
20
21void setup() {
22
23  // Setup Bridge (needed every time we communicate with the Arduino Yún)
24
25  Bridge.begin();
26
27  // Initialize the Serial
28
29  SerialUSB.begin(9600);
30
31  while (!SerialUSB); // wait for Serial port to connect.
32
33  SerialUSB.println("File Write Script example\n\n");
34
35  // Setup File IO
36
37  FileSystem.begin();
38
39  // Upload script used to gain network statistics
40
41  uploadScript();
42}
43
44void loop() {
45
46  // Run stats script every 5 secs.
47
48  runScript();
49
50  delay(5000);
51}
52
53// this function creates a file into the linux processor that contains a shell script
54// to check the network traffic of the Wi-Fi interface
55void uploadScript() {
56
57  // Write our shell script in /tmp
58
59  // Using /tmp stores the script in RAM this way we can preserve
60
61  // the limited amount of FLASH erase/write cycles
62
63  File script = FileSystem.open("/tmp/wlan-stats.sh", FILE_WRITE);
64
65  // Shell script header
66
67  script.print("#!/bin/sh\n");
68
69  // shell commands:
70
71  // ifconfig: is a command line utility for controlling the network interfaces.
72
73  //           wlan0 is the interface we want to query
74
75  // grep: search inside the output of the ifconfig command the "RX bytes" keyword
76
77  //       and extract the line that contains it
78
79  script.print("ifconfig wlan0 | grep 'RX bytes'\n");
80
81  script.close();  // close the file
82
83  // Make the script executable
84
85  Process chmod;
86
87  chmod.begin("chmod");      // chmod: change mode
88
89  chmod.addParameter("+x");  // x stays for executable
90
91  chmod.addParameter("/tmp/wlan-stats.sh");  // path to the file to make it executable
92
93  chmod.run();
94}
95
96// this function run the script and read the output data
97void runScript() {
98
99  // Run the script and show results on the Serial
100
101  Process myscript;
102
103  myscript.begin("/tmp/wlan-stats.sh");
104
105  myscript.run();
106
107  String output = "";
108
109  // read the output of the script
110
111  while (myscript.available()) {
112
113    output += (char)myscript.read();
114
115  }
116
117  // remove the blank spaces at the beginning and the ending of the string
118
119  output.trim();
120
121  SerialUSB.println(output);
122
123  SerialUSB.flush();
124}