There should be no problems running the BLE Blinky Client example on the nRF52840 Dongle. Please check out the "Adapt a BLE example (with SoftDevice)" section in our nRF52840 Dongle programming tutorial. To summarize, the only thing you should need to do is to update the Preprocessor Definitions by replacing BOARD_PCA10056 with BOARD_PCA10059 in your project.
I compiled the "ble_app_blinky_c_pca10040_s132" on a nRF52DK as a cliant and the "ble_app_blinky_pca10059_s140" on a nRF52480 dongle as a server for testing the example of "BLE Blinky Client Application Example". But, the cliant board doesn't seem to be scanning the server board. In addtion, I'm not sure the LED bottun assignment in this case. I'm grad if you could advice me about these.
