A Survey of Industrial Internet of Things Platforms for Establishing Centralized Data-Acquisition Middleware: Categorization, Experiment, and Challenges

Table 4

Average data-acquisition rates of different welding machines.

	ID	Total count	Acquisition ratio (%)
Wired communication (average ratio: 99.940%)	Welder #1	863779	99.974
	Welder #2	863715	99.967
	Welder #3	863785	99.975
	Welder #4	863754	99.972
	Welder #5	863742	99.970
	Welder #6	860002	99.537
	Welder #7	863761	99.972
	Welder #8	863845	99.982
	Welder #9	863861	99.984
	Welder #10	863862	99.984
	Welder #11	863861	99.984
	Welder #12	863862	99.984
LTE communication (average ratio: 98.983%)	Welder #13	863862	99.984
	Welder #14	858271	99.337
	Welder #15	844462	97.739
	Welder #16	854244	98.871