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Diffstat (limited to 'libraries/Bridge/examples/FileWriteScript')
-rw-r--r-- | libraries/Bridge/examples/FileWriteScript/FileWriteScript.ino | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/libraries/Bridge/examples/FileWriteScript/FileWriteScript.ino b/libraries/Bridge/examples/FileWriteScript/FileWriteScript.ino new file mode 100644 index 0000000..b550db2 --- /dev/null +++ b/libraries/Bridge/examples/FileWriteScript/FileWriteScript.ino @@ -0,0 +1,82 @@ +/* + 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 + + This example code is in the public domain. + + */ + +#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(); +} + |