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39 lines
1.9 KiB
Markdown
39 lines
1.9 KiB
Markdown
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### About
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This example enables to execute arbitrary Javascript directly from the command line on the RIOT shell.
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### Acknowledgement
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This example is based on [Jerryscript](https://github.com/jerryscript-project/jerryscript) which does all the heavy lifting, providing full ECMAScript 5.1 profile on your IoT device (kudos guys!).
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### Caveats
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- On your local board: best used with a serial communication program such [minicom](https://help.ubuntu.com/community/Minicom) instead of PyTerm (see why below).
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- On a testbed: you can try it on [IoT-lab](https://www.iot-lab.info). Tested and works so far on [IoT-lab M3](https://www.iot-lab.info/hardware/m3/), upload and flash the .elf, ssh into the node, and script away!
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- Except in the `print` instruction in your script, you have to replace single brackets `'` with `\'`.
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- Expect some issues with PyTerm which interprets by default the first `;` as the end of the script command. Furthermore, if the script is long, PyTerm seems to get confused (hence the recommended use of minicom). To start playing with PyTerm, first edit `;` line 256 of RIOT/dist/tools/pyterm/pyterm
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### How to build
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Type `make flash`. Then use your preferred serial communication tool to land in the RIOT shell.
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Note: you may have to type `reboot` or to press `RESET` on the board (after the flash).
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### Running the example
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In the RIOT shell, `help` will provide the list of available commands.
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The `script` command will run the test script code that you input in the command line.
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Some examples of scripts you can try:
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```
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script print ('hello');
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```
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```
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script var x = Math.sqrt (64); var txt = \'\'; while (x>1) { txt += --x + \'\\n\';} print (txt);
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```
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```
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script var person = { fname:\'John\', lname:\'Doe\', age:25 }; var text = \'\'; var x; for (x in person) { text += person[x] + \'\\n\'; } print (text);
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```
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Remark: outside of the print command, you may have to replace single brackets ' with \'.
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