The documentation stated that the smart MAC D105 contact 4 allows to connect 5 temperature sensors type DS18x20 or one
temperature and humidity sensor DHT22

How to do it. As far as I can see on sensors-e.g. Sealed masterkitovskij temperature sensor DS18B20

• 1-wire interface
  
• Red wire U Pete.
• Black wire GND
• Yellow wire Data

but it is not clear where any wires, and what to do for example with second or third sensor.

I just configured the device.

I enabled mqtt server config wit username and password.

Unfortunately in mqtt logs I cannot see the username from the smart-mac but just:

1557525454: New connection from 10.x.xx.xxx on port 1883.
1557525454: Sending CONNACK to 10x.xx.xxx (0, 5)
1557525454: Socket error on client , disconnecting.

The brochure stated from -30 up to 70 on how real these figures? Because I plan to put the energy monitor on the street.

В этой теме можно поделиться своим вариантом подключения.

Хотя, если подключение нестандартное или с хитринкой, можно и отдельную тему создать, для обсуждения и советов.

Порекомендуйте пожалуйста счётчики воды и газа, которые возможно интегрировать в вашу систему.

Спасибо.