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And that’s exactly why I’m writing this piece - to help us demystify some of these features and take our Node.js learning to the next level. However, if mysteries get you really curious, and you’ll stop at nothing to satisfy your curiosity, and if you want to take your Node.js understanding to the next level, then you really want to dig deeper to understand the many core features of Node.js, like Buffer, for example. Well, true, you might never work with them directly if you chose to remain an average Node.js developer. And some will brazenly tell you that you don’t need to understand them because you might never work with them directly. Sadly, many tutorials and books will jump straight to teaching how to develop web applications with Node.js packages without letting you understand the core features of Node.js and why they exist. Indeed, those words could be very intimidating, especially when you’re coming into web development with Node.js without any CS degrees. This is perhaps better explained with an example:Įxec 4"$DEV" "$DEV" means simultaneously also redirect it to the USB serial port and lastly, "$DEV" to the end of every line, the serial port will remain open for the duration of the whole script.Are you always mystified, like me, whenever you come across words like Buffer, Stream, and binary data in Node.js? Does that feeling make you shrink from understanding them, thinking they are not meant for you but only for Node.js gurus and package developers to understand? After that, any program that reads and writes to stdio will talk to the serial port.

Slow devices may be fine and dandy, but the same script with a faster device may never work right and leave you banging your head against the wall in frustration.Ī simple trick to avoid opening and closing the port with each line of code, is to use the exec program to do permanent redirection of the stdio files. Unknown also and may contain older junk making it hard to find what you are really looking for.

Takes time, so it can drop characters and the buffer contents become Scripts, you will find that each time you open and close the port, it

You could use chat to do scripts more effectively than with standard bash commands. The chat program is part of the pppd package and is probably installed by default.

If the response was good, then do an actionĪutomating that with echo, cat and if statements is difficult and most of the program may end up being error handlers.

If you need the received data in a Bash variable for further processing, do this:Ī typical exchange with a radio or other embedded device goes something like: The /tmp file system is a RAM disk, so it is much faster than writing to a hard disk.