create a connection between serial console and bluetooth serial port

create a connection between serial console and bluetooth serial port

first all  the bluez apps  must be updated

root@raspberrypi:/home/pi# vi /etc/systemd/system/dbus-org.bluez.service 
add:

[Unit]
Description=Bluetooth service
Documentation=man:bluetoothd(8)
ConditionPathIsDirectory=/sys/class/bluetooth

[Service]
Type=dbus
BusName=org.bluez
ExecStart=/usr/lib/bluetooth/bluetoothd -C --noplugin=sap
ExecStartPost=/usr/bin/sdptool add SP
NotifyAccess=main
#WatchdogSec=10
#Restart=on-failure
CapabilityBoundingSet=CAP_NET_ADMIN CAP_NET_BIND_SERVICE
LimitNPROC=1
ProtectHome=true
ProtectSystem=full

[Install]
WantedBy=bluetooth.target
Alias=dbus-org.bluez.service

the entry:  --noplugin=sap   was util to me, because i was getting an error on 
Nov 11 09:41:40 530uarch bluetoothd[1495]: Starting SDP server
Nov 11 09:41:40 530uarch bluetoothd[1495]: Bluetooth management interface 1.7 initialized
Nov 11 09:41:40 530uarch bluetoothd[1495]: Sap driver initialization failed.
Nov 11 09:41:40 530uarch bluetoothd[1495]: sap-server: Operation not permitted (1)


sudo apt-get install bluez

root@raspberrypi:/home/pi# sudo hciconfig
hci0:	Type: Primary  Bus: USB
	BD Address: 00:11:67:60:A9:1C  ACL MTU: 678:8  SCO MTU: 48:10
	UP RUNNING PSCAN 
	RX bytes:18061 acl:338 sco:0 events:1533 errors:0
	TX bytes:57330 acl:1328 sco:0 commands:121 errors:0


pi@raspberrypi:~ $ sudo bluetoothctl
[NEW] Controller 00:15:83:0C:BF:EB raspberrypi [default]
[NEW] Device 14:1A:A3:D4:5D:73 XT1039
[bluetooth]# power on

[bluetooth]# pair 14:1A:A3:D4:5D:73

pi@raspberrypi:~ $ sdptool add --channel=1 SP

Start serial port service on RPI
The Bluetooth serial port (SP) service is handled by “rfcomm”. It starts a terminal with”agettty” and shows a login screen when a bluetooth connection is made to channel 1. The “rfcomm” needs to be running for a connection to work. I have used the “screen” command to keep the process alive in the background in a virtual terminal.

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screen sudo rfcomm watch /dev/rfcomm0 1 /sbin/agetty rfcomm0 linux 115200
Waiting for connection on channel 1

install blueterm app on your android


Credits comes from:

https://hobbylad.wordpress.com/2016/10/13/rpi-control-over-bt-android/