The 4th byte in the RTC data packet is the "day of year" - that should be a value in the range 0-365 - but we're sending an 8-bit value there, so it's limited to the range 0-255. This is a bug. 😁
To fix this we need to change the protocol either to send the day of year as 2 bytes or to adopt a bit from one of the other bytes that get sent across.
The 4th byte in the RTC data packet is the "day of year" - that should be a value in the range 0-365 - but we're sending an 8-bit value there, so it's limited to the range 0-255. This is a bug. 😁
To fix this we need to change the protocol either to send the day of year as 2 bytes or to adopt a bit from one of the other bytes that get sent across.