This is a node to fit in James' 3D printed gutter enclosure. An Atmel ATMEGA328P means it is Arduino compatible.
It has a CN3083 solar/LiPo charger on board. It also has a footprint for a HTU21D temperature/humidity sensor.
There are connections broken out for a DHT22 temperature/humidity sensor, and serial TX/RX.
Error states are other combinations of the TP outputs, you should check the datasheet for details.