feat: support more ENV VARS for configuration (#788)

README.md

@@ -82,6 +82,7 @@ After a [discussion](https://github.com/OpenZWave/Zwave2Mqtt/issues/201) with Op
     - [Mesh](#mesh)
     - [Debug](#debug)
   - [Health check endpoints](#health-check-endpoints)
+  - [Environment variables](#environment-variables)
   - [:question: FAQ](#-faq)
   - [:pray: Thanks](#-thanks)
   - [:pencil: TODOs](#-todos)
@@ -804,6 +805,17 @@ Remember to add the header: `Accept: text/plain` to your request.
 
 Example: `curl localhost:8091/health/zwave -H "Accept: text/plain"`
 
+## Environment variables
+
+_**Note**: Each one of the following environment variables corresponds to their respective options in the UI settings and options saved in the UI take presence over these environment variables._
+
+- `OZW_NETWORK_KEY`
+- `OZW_SAVE_CONFIG`
+- `OZW_POLL_INTERVAL`
+- `OZW_AUTO_UPDATE_CONFIG`
+- `OZW_CONFIG_PATH`
+- `OZW_ASSUME_AWAKE`
+
 ## :question: FAQ
 
 > A: Why when I add a value to Gateway values table I don't see all my devices?

lib/ZwaveClient.js

@@ -136,6 +136,10 @@ async function init (cfg, socket) {
   this.closed = false
   this.scenes = jsonStore.get(store.scenes)
 
+  cfg.saveConfig = cfg.saveConfig || process.env.OZW_SAVE_CONFIG
+  cfg.autoUpdateConfig =
+    cfg.autoUpdateConfig || process.env.OZW_AUTO_UPDATE_CONFIG
+
   // Full option list: https://github.com/OpenZWave/open-zwave/wiki/Config-Options
   var options = {
     Logging: cfg.logging,
@@ -146,7 +150,7 @@ async function init (cfg, socket) {
     SaveConfiguration: Boolean(cfg.saveConfig),
     //  RetryTimeout: 10000,
     //  IntervalBetweenPolls: true,
-    PollInterval: cfg.pollInterval,
+    PollInterval: cfg.pollInterval || process.env.OZW_POLL_INTERVAL,
     AutoUpdateConfigFile: Boolean(cfg.autoUpdateConfig)
     // SuppressValueRefresh: true,
   }
@@ -158,11 +162,11 @@ async function init (cfg, socket) {
   }
 
   if (cfg.configPath) {
-    options.ConfigPath = cfg.configPath
+    options.ConfigPath = cfg.configPath || process.env.OZW_CONFIG_PATH
   }
 
   if (cfg.assumeAwake) {
-    options.AssumeAwake = cfg.assumeAwake
+    options.AssumeAwake = cfg.assumeAwake || process.env.OZW_ASSUME_AWAKE
   }
 
   if (cfg.options) {