Adding a packet confirmation command in Arduino

Let’s kick things off by using your existing Arduino code as it is—no need for any fancy changes just yet.
First up, we’re talking about packet headers.
Make sure to check for STX, ETX, and CMD; if the first byte isn’t STX, just return false, simple as that.
Then, we have the full packet check, which you should totally enable; it ensures your packet is accurate and will return true if everything checks out.
If you’re doing this, using Visual Studio Code is a wise choice due to the limitations you might face with the Arduino IDE.
And don’t forget to ensure your SD card is properly formatted for compatibility and to keep those backups safe.
Lastly, keep an eye on that last byte, ETX; if it’s not right, your data stream could be incomplete or corrupted, and that’s not what we want!.

Let’s dive into the process of figuring out buffer length; it kicks off with identifying STX and Len, but leaves out the other bytes.
Basically, Len is all about the total buffer length minus 2, and once you add those two back in, you get the full picture.
Now, if the MAC doesn’t match what we expect, it just returns false to keep everything tidy.
When it comes to switch shot data, it’s marked by command byte B, known as PCDA.
This tells us that the data is fresh and specific commands are in play for bot actions.
Speaking of commands, they’re neatly grouped into A, B, and C—and if any command pops up, the switch statement quickly exits.
Plus, the default case is there to keep behavior consistent by returning false..

So, let’s talk about how we keep our data consistent.
First off, we calculate a checksum (CS) and double-check it against the specified byte to make sure everything adds up.
This final verification step is super important for reliability.
Once we confirm that there are no issues, we go ahead and generate the necessary components.
We also get rid of any unnecessary buffers, and then we use Serial.print() to show the check packet.
By throwing in an if statement, we make sure its integrity is intact.
All these careful steps really boost our confidence in the packet’s accuracy, and we even play around with the data to see how the checksum works in action..