#/bash/bin
sudo gatttool -b 80:EA:CA:00:00:03 -I
# All these commands are typed in interactive mode
connect
while [ 1 ]; do
char_read_hnd 0x0030 > a.txt
done
exit 1

sudo gatttool -b 80:EA:CA:00:00:03 -I  <<EOF
 # All these commands are entered in interactive mode
connect
while [ 1 ]; do
char_read_hnd 0x0030 > a.txt
done
exit 1
EOF

gatttool -i hci0 -b device=MAC --char-write-req -a handle=0x0001 -n value=0x0001

gatttool -i hci0 -b device=MAC --char-read -a handle=0x0001