BLE sensors data through a connect, LYWSD03MMC and MHO-C401 add (#736)

* Add LYWSD03MMC and MHO-C401 device
and an associated BLE connect mechanism as these devices advertise only encrypted data
-free manufacturer data
-update library

* Implement scans number before connect
-Add the possibility to do a connect every X scan
-Rename variables for consistency
-Some refactoring for improved code reading

docs/prerequisites/devices.md

@@ -20,6 +20,8 @@ OpenMQTTGateway is able to scan all the BLE devices that advertise their data so
 | Vegtrug ||temperature/moisture/luminance/fertility|
 | XIAOMI Mi Flora |HHCCJCY01HHCC|temperature/moisture/luminance/fertility|
 | XIAOMI Mi Jia |LYWSDCGO|temperature/humidity/battery|
+| XIAOMI Mi Jia 2 *|LYWSD03MMC|temperature/humidity/battery/volt|
+| XIAOMI MHO-C401 *|MHO-C401|temperature/humidity/battery/volt|
 | XIAOMI Mi Lamp |MUE4094RT|presence|
 | HONEYWELL |JQJCY01YM|formaldehyde/temperature/humidity/battery|
 | INKBIRD *|IBS-TH1|temperature/humidity/battery|