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You bet. If you're looking at the 840 SoC alone then you wouldn't have to look any further than attached blinky examples with Coded PHY enabled (found them on the Nordic DevZone - SDK16), there's a few nuances with the extended advertising that I've already had the pleasure of struggling through. So if I can save you some time, please don't hesitate.
Additionally if you're interested in examples with PA/LNA configuration, I have some custom-tweaked examples of a few different long-range modules as well. In my experience, if you really want to cut through all the noise I'd definitely recommend this option. I tested the firmware with two PA/LNA enabled boards in the middle of a crowded Chicago neighborhood and, like I mentioned I could not walk far enough to break the connection. Boards without it broke in less than 20m even with extended PHY channels. Let me know and I can drop those here as well (I'll have to clean them up a bit lol).
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Thanks for all the info here! Good points were made, I actually did not realize you were modding shelf products, whoops - but that's cool!
I am working on a small breakout for a certified 840 module that will go the distance, and I've already written firmware (modded from the SDK) that enables long distance on the extra PHY channels (incorporating GPS and all the other goodies is on my to do list). But let me tell you, I CANNOT walk far enough to get the connection to break between two devices, it's insanely solid. I've confirmed 200+ meters with LEDs blinking on Button events from the other device and I would not be surprised if the sucker went for a mile. Would be happy to share :)
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The 832 is a great chip but I'm intrigued at the possibility for a connectable smartwatch at long-range. I'm familiar with the 52840 and would be happy to work on a long range version of any applicable engineering files for the Bangle. If someone at Espruino gave me the pcb files and source code, I can even work on a long range solution (with other benefits from the 840) to give to Espruino if there's interest. Let me know,
Sam
Using this as well! Thanks mate!