Bug fix and improved diagInfos method (thanks to turmary)
Fix: mHardwareTxFIFOFull = true will block the transmitter if call begin() multiple times without constructor;
Add: diagInfos() could also read register BDIAG0_REGISTER.
Fix: mHardwareTxFIFOFull = true will block the transmitter if call begin() multiple times without constructor;
Add: diagInfos() could also read register BDIAG0_REGISTER.