Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Practical Marine Wireless Sensor Network Monitoring System Based on
  LoRa and MQTT   Under the advocacy of the international community, more and more research
topics have been built around the ocean. This paper proposed an implementation
scheme of marine wireless sensor network monitoring system based on LoRa and
MQTT. Different from the traditional network architecture, the system was
constructed by combining with two network forms, and according to their
respective characteristics, the overall design followed the transition from
LoRa to MQTT. We first used LoRa to interconnect the sensor nodes with the
gateway, and on this basis, the collected data was sent to the server
visualization platform through MQTT, the backend management server would
continuously refresh the monitoring page. At the same time, the client could
use a browser-based web application to directly access and call data for global
maritime information monitoring. In the future, we will further improve the
system and optimize the algorithm, to achieve more dimensions and deeper
exploration of the underwater world.

17
The categories of this paper are: q-fin
21
The categories of this paper are: adap-org
31
The categories of this paper are: ao-sci
16
The categories of this paper are: stat
34
The categories of this paper are: chem-ph
13
The categories of this paper are: quant-ph
3
The categories of this paper are: physics
20
The categories of this paper are: acc-phys
27
The categories of this paper are: comp-gas
33
The categories of this paper are: plasm-ph
28
The categories of this paper are: alg-geom
18
The categories of this paper are: econ
10
The categories of this paper are: q-bio
24
The categories of this paper are: dg-ga
22
The categories of this paper are: chao-dyn
36
The categories of this paper are: cmp-lg