Table 16 Scalability analysis.

From: An IoT based remote medical diagnosis system using one time pad cipher over MQTT protocol

Concurrent devices

Aggregate throughput (msg/s)

Avg. end-to-end latency (ms)

EMQX CPU (%)

EMQX memory (MB)

Avg. ESP32 CPU (%)

Key-distribution latency (ms)

5

25

40

12

120

18

12

10

50

55

28

210

20

25

15

75

75

45

360

22

60