I'm essentially building a BLE to UART gateway to allow our microcontroller device to talk to our apps. The BLE section is the nRF52840 and I'm trying to simply use it to pass through the data from the UART (from the microcontroller) to the BLE using the NUS.
For some reason, when the initial data payload comes back from the microcontroller to the nordic is losing the 7th byte. EVERYTHING beyond that appears to be there, but I don't currently have it properly splitting across multiple packets yet.
I believe that the issue I'm running into is exactly the same one in the below link, but this is using ncs_v2.5.0 and not the older sdk16 or sdk17.
https://devzone.nordicsemi.com/f/nordic-q-a/105313/losing-uart-characters---activating-uart-in-place-of-uarte-in-nrf52840
Right now I'm at a loss as to where the issue is, other than obviously I'm not getting into the interrupt quickly enough when the data is flowing out. I've read other forum posts as well which mention various similar aspects, but nothing seemed to ever have a direct fix mentioned other than it was fixed. I'm at a big loss as to root cause, as I believe the issue exists in my Zephyr and ncs_v2.5.0 setup, as the bare-metal side doesn't have the same issue. I have scoped the line, and the data IS there, it's just not entering the nordic system to be bypassed.
My project file uses the following configurations with regards to the UARTE and uses flow control.
