2 static peripherals ok

now the central can connect to two static peripheral, write/read without
scanning.
fix to r/w handle 0x32
change write data to 5 bytes
modification half-way
test polling successful
update the direction flag

add a static direction flag to avoid the side effects of using char5[4]
all the logic is ok

now can send data back and forth
works with iPad

but after 1 return, the master stops working.
logic fix and prepare fox next relay