Add mqtt2prometheus details

README.md

@@ -14,3 +14,66 @@ PocketLAN, if you can. I'll be switching as soon as I'm able to.
 The PocketWIFI squirts MQTTS to their cloud servers, but they don't verify TLS
 so it can be trivially intercepted. However, the messages are in a useless (to
 me) binary format.
+
+Once the metrics are in MQTT, they can be sent to prometheus using
+[`mqtt2prometheus`](https://github.com/hikhvar/mqtt2prometheus):
+
+```yaml
+---
+# Remaining mqtt2prometheus options...
+json_parsing:
+  separator: .
+metrics:
+ - prom_name: inverter_ac_volts
+   mqtt_name: inverter.ac_net_voltage_volts
+   help: AC voltage measured by the inverter
+   type: gauge
+ - prom_name: inverter_ac_output_amps
+   mqtt_name: inverter.ac_out_current_amps
+   help: Inverter AC current
+   type: gauge
+ - prom_name: inverter_ac_output_watts
+   mqtt_name: inverter.ac_out_power_watts
+   help: Inverter AC power
+   type: gauge
+ - prom_name: inverter_pv1_volts
+   mqtt_name: inverter.pv1_voltage_volts
+   help: String 1 voltage
+   type: gauge
+ - prom_name: inverter_pv1_amps
+   mqtt_name: inverter.pv1_current_amps
+   help: String 1 current
+   type: gauge
+ - prom_name: inverter_pv1_watts
+   mqtt_name: inverter.pv1_power_watts
+   help: String 1 power
+   type: gauge
+ - prom_name: inverter_ac_hz
+   mqtt_name: inverter.ac_net_frequency_hz
+   help: AC frequency measured by the inverter
+   type: gauge
+ - prom_name: inverter_status
+   mqtt_name: inverter.status
+   help: Inverter status
+   type: gauge
+ - prom_name: inverter_generated_kwh_total
+   mqtt_name: inverter.energy_generated_kwh_total
+   help: KWh generated to date
+   type: counter
+ - prom_name: inverter_generated_kwh_today
+   mqtt_name: inverter.energy_generated_kwh_today
+   help: KWh generated today
+   type: gauge
+ - prom_name: inverter_external_temperature_kelvin
+   mqtt_name: inverter.temp_external_kelvin
+   help: Temperature measured from the outside of the inverter
+   type: gauge
+ - prom_name: inverter_internal_temperature_kelvin
+   mqtt_name: inverter.temp_internal_kelvin
+   help: Temperature measured from the inside of the inverter
+   type: gauge
+ - prom_name: inverter_runtime_hours_total
+   mqtt_name: inverter.runtime_hours
+   help: Inverter runtime
+   type: counter
+```