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