Have finished RIB king gate opener/controller based on NRF52840 & MySensors.
image url)

@NeverDie a big thank you as I was inspired by many of your post and this was my first Nrf5 project. The backplate is designed in KiCAD and then outsourced for etching to one local semi-hobby service. Modules are then connected via precision header pins (concept inspired by Ardumower)

@omemanti @mfalkvidd Thank you, I think I did it. It works now - or I hope so from the code.

** Programming Finished **
** Verify Started **
nrf51.cpu: target state: halted
target halted due to breakpoint, current mode: Thread 
xPSR: 0x61000000 pc: 0x2000002e msp: 0x20004000
verified 1412 bytes in 0.038633s (35.692 KiB/s)
** Verified OK **
** Resetting Target **
shutdown command invoked

What I was confused is that there is erase sketch, but to make it erased there is this trick with burn bootloader. Still the port is greyed out, but it seems I am able to flash blank sketch. Thanks

Still valid in 2020. Got a compilation error "Error resolving FQBN: missing". Downgrade to 1.8.9 helped

I have read this thread, have bought a few E73-2G4M08S1C modules for experimenting, downloaded platformio and tried to flash it. I recognized I am not able to do it with my STM32 link V2 programmer in platformio. Could somebody summarize what are the current options to flash NRF52840? Is there a way how to use STM32 link V2 or we just need to IDE from Arduino to Platformio and invest into new programmer (DK/BMP)?

@NeverDie a big thank you as I was inspired by many of your post and this was my first Nrf5 project. The backplate is designed in KiCAD and then outsourced for etching to one local semi-hobby service. Modules are then connected via precision header pins (concept inspired by Ardumower)

Have finished RIB king gate opener/controller based on NRF52840 & MySensors.
image url)

Prices of bulb went dirty cheap. I have bought bluetooth version https://www.ebay.com/itm/15W-LED-bulb-RGB-bluetooth-APP-control-Dimmable-globe-lamp-for-Google-home-Alexa/254349689226 and thinking of connecting to MySensors (have GW or RPi3 and OpenHab2). In my case I need only white color and some dimming capabilities and I was able to crack down the bluetooth protocol, so I can controll it from raspberry via console (but there will not be direct connection once installed due to longer distance).

There are more than one alternatives how to Mysensorize it:
1/ disassembly bulb and solder out BT module, then replace it for NRF5 modules - problems - the space is very limited, voltage incompatibility, requires another PCB and probably some pasive electronics
2/ run extra bluetooth / Zigbee mesh besides the mysensors and let the Controller talk to each network separatelly
3/ select another bulb where the integration will be easier - which one?
4/ construct extra node which will be bridge between MySensors and bluetooth

Which one is the smartest solution in 2020. I have the same task with several other aplication like BT heating valves.
Thank for your ideas!

Still valid in 2020. Got a compilation error "Error resolving FQBN: missing". Downgrade to 1.8.9 helped

@omemanti @mfalkvidd Thank you, I think I did it. It works now - or I hope so from the code.

** Programming Finished **
** Verify Started **
nrf51.cpu: target state: halted
target halted due to breakpoint, current mode: Thread 
xPSR: 0x61000000 pc: 0x2000002e msp: 0x20004000
verified 1412 bytes in 0.038633s (35.692 KiB/s)
** Verified OK **
** Resetting Target **
shutdown command invoked

What I was confused is that there is erase sketch, but to make it erased there is this trick with burn bootloader. Still the port is greyed out, but it seems I am able to flash blank sketch. Thanks

1. I've downloaded the source files and tried to compile them.
   I got fatal error: sketch/MyBoardNRF5.h: No such file or directory

2. Then I renamed MyNRF5Board.h to MyBoardNRF5.h
   I got #error No forward link or gateway feature activated. This means nowhere to send messages! Pretty pointless.

3. Then I added #define MY_GATEWAY_SERIAL into the code
   I got many errors i.e. 'PIN_AIN0' was not declared in this scope

How to compile the downloaded source files?

I am starting to experiment with NRF51822. Thank you all for this thread. I am stuck with setting up IDE on Win10 and my MCU is not communicating. What is the correct setup for Arduino IDE?
I have Port still grayed out and error: The selected port not exist

Could that be related to drivers? I've run Zadig, there are more options and I've tried all four of them

I am not able to upload even erase sketch. Any suggestion where to focus (IDE/Zadig/other)?

Same by me - combination of Rapberry 3 + mosquitto + OpenHab2. 2.1.1. doesn't start at all (TSM:INIT:TSP FAIL), 2.2.0 beta starts without troubles but after a few minutes the communication is lost (!TSF:MSG:LEN,0!=32). Have capacitors on the node and gateway.

In my case the problem is related to MQTT gateway, so not sure if that helps.