This level could be used, for example, with ambientsensor data where it does not matter if an individual reading is lost as the next one will be published soon after.
这一级别可用于如下情况，环境传感器数据，丢失一次读记录无所谓，因为不久后还会有第二次发送。
2
Four pins means you can have four sensors, say two temperature sensors, one for ambient and the other for panel temperature, a light sensor, and a wind speed sensor.