ble-pasv-mqtt-gw.js : Add interval send message mqtt

[chris777c]

Is your feature request related to a problem? Please describe.
In script ble-pasv-mqtt-gw.js, I would decrease the number of sending mqtt message in hour.
I try to implement interval_ms in BLE.Scanner.Start but no effect on send mqtt message frequency.

Describe the solution you'd like
Can you add config parameter for set interval mqtt send message, please ?

Describe alternatives you've considered
N/A

Additional context
N/A