RT_MBRTK_Attitude Roll, pitch, yaw and accuracy
RT_MBRTK_Attitude: 140, 32 (0x8C2020 + unit id) (0x320)
Bytes 2-3: MB-RTK Yaw (degrees)
Bytes 4-5: MB-RTK Pitch (degrees)
Bytes 6-7: MB-RTK Roll (degrees)
MB-RTK Yaw, pitch and roll resolution are degrees/100.
This message is used for attitude calculated from the MB-RTK (moving-base RTK) solution only, with no inertial input.