Though, it had some reasonably long scripts for commissioning and decommissioning devices that I was able to get rid of, thanks to Greengrass. I’ve never even seen the first version, but at its core, the Greengrass version is still quite similar to the second version. Then I took the important parts out of that version and wrapped Greengrass around them. We started with a more-or-less homegrown solution and later re-wrote it using AWS IoT. The Greengrass version is the third iteration of this project. I’ll also explain what Greengrass is, so if you’re not familiar with it already, just bear with me. We don’t own the IP for that part, so we’ve included a mock version of it instead. The only catch is that you’ll have to write the part that actually sends the receipts to the printer driver. You can also use the project to set up a cloud-printing system of your own. I’ll explain those in detail further along in the article. That said, this is my first attempt at using Greengrass, so a few of the choices I made along the way may serve better as examples of what not to do. It’s a complete, working project, but simple enough to hopefully work well as an example for other engineers working on Greengrass projects.
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