fix requirements

README.md

@@ -1,11 +1,23 @@
 # Prometheus Exporter
 
-Export BFFH Data as Prometheus Metric
+Export BFFH Data as Prometheus Metric.
 
-# Env Variables
-* POLLING_INTERVAL_SECONDS = 5
-* EXPORTER_PORT = 9000
-* BFFH_HOST = localhost
-* BFFH_PORT = 59661
-* BFFH_USER = Admin1
-* BFFH_PASSWORD = secret
+The exporter uses the [pyfabapi](https://docs.fab-access.org/books/schnittstellen-und-apis/page/fabaccess-api#bkmrk-pyfabapi) (Python API wrapper for FabAccess API) to access the resource list (machines) and their states and meta information (names, categories).
+
+Sample line:
+```
+bffh_machine_state{category="Central Stairs",machine_id="zam-raum1-ecke1-lamp",machine_name="1 Lampe"} 1.0
+```
+
+# Installation & Documentation
+Please see [docs.fab-access.org](https://docs.fab-access.org/books/schnittstellen-und-apis/page/monitoring-prometheus-loki-und-grafana#bkmrk-installation-von-fab) for installation steps and how to use together with Grafana.
+
+## Installation with Docker
+In case you want to use the provided Dockerfile, you can use the following environment variables to run:
+
+* `POLLING_INTERVAL_SECONDS` = 5
+* `EXPORTER_PORT` = 9000
+* `BFFH_HOST` = localhost
+* `BFFH_PORT` = 59661
+* `BFFH_USER` = Admin1
+* `BFFH_PASSWORD` = secret

pyfabapi

@@ -1 +1 @@
-Subproject commit 286aca04723a6bca0dbdb4cc6928650f8764bb34
+Subproject commit 7a4473f39a989b926eea0185fa665021baed6988

requirements.txt

@@ -1,6 +1,6 @@
 asyncio-mqtt
-pycapnp
+pycapnp==1.3.0
 prometheus_client
 requests
 prometheus-async
-aiohttp
+aiohttp