SDK UART coexistence example problem

[Marry]

Hello,

I am trying to follow the tutorial SDK UART coexistence example, but it seems like the last step cannot be completed. As you can see, that .hex file does not exist in the folder. Do you have any suggestion?

Thanks. 

[Marry]

Hi Ms. Marte Myrvold,

I sucessfully built the SDK UART coexistence example and now I am trying to test it - but I am not successful.

What I'd like to do is to :

1. First connect to the nRF board with the nRF Mesh App (then assign it with some address). And afterwards, 

2. Check the UART functionality by sending some data from the phone to the board. And visualise that with putty.

Unfortunately, none of the steps works. I cannot connect with nRF mesh from the phone. And also in the nRF connect, I cannot find the option for writing into a characteristic, which should send the message to the board and then see it with putty. 

Maybe the Mesh Proxy Data In should be the answer for step number 2. However, nothing pops up in putty, so I would say that the board does not receive this message. 

Do  you have any idea how to debug this problem?

Thanks in advance!

[Marry]

Ms. Marte Myrvold, is it possible that I  did not do the last step from the coexistence example correctly?

I just replaced the .hex file:

Is there some other trick? Thanks!

[Marry]

I see in this post that  "SDK UART coexistence example does not work with nRF Mesh APP. You need find some other provisioning ways..." - So, I wonder: is this true   

Could you test this project successfully 

[Marte Myrvold]

Hi,

I'm sorry for the late reply. I had to test this example myself and it took some time.

The guide can be a bit confusing when it comes to the last part with the light switch example, but I will try to explain the process here.

• You need two DKs, one for the light switch server example and one for uart coexistence example.
• Build and flash the light switch server example as explained in the guide for the example on one of the DKs.
• Instead of flashing light switch client to the second DK, you should instead flash the SDK uart coexistence example to it, after following the guide for the example (copying the ble_app_uart_coexist folder to examples/ble_peripheral in nRF5 SDK etc.)

I just tested that this works. However, I used the provisioner example in the nRF Mesh SDK instead of the Mesh app as it fixes everything with provisioning so you don't have to do it manually, which you have to do with the nRF Mesh app. In order to test it with the provisioner example like I did, you should do the following:

• Build and flash light switch server and uart coexistence on two DKs as explained above.
• Build and flash the provisioner example on a third DK. I did not have to change or do anything with the example for it to work as intended.
• Turn on the three DKs and press button 1 on the provisioning board in order to start the provisioning process.
• When LED 1 on the provisioning board remains lit steadily for a few seconds, all available boards have been provisioned and configured, and you can start testing the example.
• Open nRF Connect app on your phone and connect to NORDIC_UART (which is the uart coexistence board)
• Simulate button presses on the uart coexistence board by sending a number (1-4) to it using the nRF Connect App. You will then see the LEDs on the light switch server board are turned on and off. For example, sending 1 will turn on LED1, and 2 will turn it off. You can also check that this is the same as when you press buttons 1 and 2 on the uart coexistence board.

I hope this helps you understand how to test this out.

As for the question about the uart coexistence example not working with the nRF Mesh App. This is because the nRF Mesh app does provisioning over GATT, since smart phones don't support provisioning or Mesh activity over ADV. However, the uart coexistence example does not use GATT (both GATT proxy and GATT provisioner bearer are disabled). This is likely because the example is a combination of mesh and BLE examples, so you already have BLE+mesh there, and the the GATT proxy functionality will make it so you kind of get an additional instance of BLE. You could try to implement GATT provisioning and functionality in the example yourself, but I don't know if it will work, and I wouldn't recommend it.

Best regards,

Marte

[Marry]

Hi Ms. Marte Myrvold and thank you very much for the complete and well documented answer!

I have not answered so far, because I have been waiting for another Development Board, to try the set-up which you proposed.

So my setup is now: 3 Development boards, from which 2 are nRF52840 and one is nRF52833. Unfortunately, it seems more difficult than I thought, to run the mesh on the nRF52833.

I loaded the light_switch_client_nrf52832_xxAA project and it does advertise in the nRF Mesh App so it looks like to code is successfully flashed and the board is responsive. However, neither the button (for the client code), nor the LED (for the server code) are responding. I have a guess that it may only be a problem of I/O routing, that is solvable from the code.

Do you have an idea how I could make this?

Thank you very much and I wish you a nice day!