A prometheus.io exporter for the Panasonic Aquarea H-generation heatpump, for a NodeMCU/ESP8266 connected to the CN-CNT port.

NodeMCU master branch with file, net, node, struct, timer, UART and WiFi modules. You can use the NodeMCU custom build service to build a firmware.

1. Add a file credentials.lua with the following contents:

SSID=""
WIFI_PASSWORD=""
NTP_SERVER=""

2. Upload these files to an ESP8266 running the NodeMCU firmware
3. Refer to Egyras' work for wiring

Please take note that application.lua exposes a Lua interpreter over telnet (see telnet_init()). This is intended behaviour while reverse engineering the serial protocol, but might not be what you want in your network.