[all] Many little fixes

[X9D] RxNum for PXX

src/sky9x/bluetooth.cpp

@@ -49,8 +49,8 @@ void btInit()
 }
 
 OS_FlagID btFlag;
-Fifo32 btTxFifo;
-Fifo32 btRxFifo;
+Fifo<32> btTxFifo;
+Fifo<32> btRxFifo;
 
 struct t_serial_tx btTx ;
 uint8_t btTxBuffer[32] ;