Algorithm 2. Logic Control of Gateway
Begin: JSON context of user request
1:	msg is JSON context of user request
2:	Get SDCname, SDCstate, SDCstate_Topic, and SDCcmd_Topic from JSON device state
3:	Get device_name and device_state from JSON device state
4:	if Controllable(device_name, device_state) is False then
5:	publish_message(‘False’, SDCstate_Topic)
6:	return
7:	end if
8:	set_device_state(SDCname, device_name)
9:	Get device’s type from JSON device state
10:	if msg == ‘switch controlled device’ then
11:	Update the device that SDC is controlling in JSON device state
12:	elif msg == ‘control device’
13:	According user request set device_set_value and generate command
14:	Using device_name and device_set_value to update device’s state
15:	Get device_state after update
16:	if device’s type is ‘smart device’ then
17:	publish_message(command and type, SDCcmd_Topic)
18:	elif device’s type is ‘traditional device’
19:	Get TDCname, TDCstate, TDCstate_Topic, and TDCcmd_Topic from JSON device state
20:	publish_message(command and type, TDCcmd_Topic)
21:	end if
22:	end if
23:	publish_message(device_state, SDCstate_Topic)
24:	END