International Core Journal of Engineering 2020-26 | Page 182

parsed and stored in a private cloud database.
and Bluetooth. The sensors such as temperature and
humidity, smoke sensing, and human body induction are
connected under the security sensing node, and control units
such as Led lamps and relays are connected.
Start
No
Node and coordinator
authentication
Yes
Node data upload
No
Yes
Gateway reveives
data
Classification and
packaging
No
Fig6. IoT Gateway Test Environment Deployment
Establish vpn
Yes
B. Functional Verification and Results
The Internet of Things server uses Apache to build a web
service. The environment status information collected by the
sensing node is written into the server database. The user can
view the environmental information such as temperature and
humidity and smoke detection remotely by logging in to the
webpage. Integrated remote control and one-button security
function, can remotely control the working state of the
device, set the security mode, in the security mode, when the
environment has abnormal information, the user can receive
a message reminder.
Secure transmission
Data decryption
Protocol resolution
Data storage
Finish
Fig5. Data protection process
V. P ERFORMANCE T ESTING AND F UNCTIONAL V ERIFICATION
A. Test Program
The IoT gateway test environment was built in the LAN
for verification of gateway functions and performance. The
test environment deployment is shown in Figure 5.1. As a
normal router, the gateway connects the wired network and
wireless network devices in the home. At the same time, it
acts as a coordinator to connect the sensor network, receive
information such as temperature and humidity, smoke, and
human body sensing in the sensor network, and control the
lighting of the home, the opening and closing of the curtain,
and the switching of the door. In addition, the gateway is also
a small VPN client, which supports the establishment of a
secure tunnel between the IoT server and the real-time
synchronization of the sensor network data to the IoT server
database. On the other hand, it also supports other remote
access routers. The secure access is well suited to remote
access needs.
Fig7. User Interface
The gateway WAN port is connected to the public
network, and the LAN port is connected to the LAN host.
PC2 is used to verify connectivity to the IoT server after the
VPN tunnel is established. The Internet of Things server is
built on the Ubuntu system. The server has two network
cards. The network card 1 is connected to the public network,
and the network card 2 is connected to the local area network.
Set up a WEB server (remote view or control sensor network
device), FTP server, and PC1 (to test server and gateway
connectivity) in the LAN connected to the IoT server NIC 2.
The security-aware nodes and gateways in the sensor
network are connected by different methods such as Zigbee
Fig8. Exception message reminder
The following figure shows the process of authenticating
a gateway with a server. Identity authentication is mainly for
the verification of digital certificates of both parties. The
digital certificate here is the digital certificate of SM2-with-
SM3. Before sending the certificate to the server, the
gateway first uses the public key of the CA to verify the local
certificate. After the verification is passed, the user certificate
is sent to the server, and the certificate request is sent to the
server. After receiving the peer certificate, the server verifies
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