From 04b0de6f886e7884725aadc9ddeba5386d0375d0 Mon Sep 17 00:00:00 2001
From: Sam Stenvall <sam.stenvall@nitor.com>
Date: Mon, 14 Aug 2023 20:16:18 +0300
Subject: [PATCH] Query the device address when started with slave address 0

---
 CHANGELOG.md   | 1 +
 app/modbus.mjs | 6 ++++++
 2 files changed, 7 insertions(+)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index c79bae5..f6233e5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,7 @@
 * Add missing error handling to the `/summary` route, change HTTP error responses to return JSON
 * Add `-v` option which enables debug logging
 * Start using ESLint, add `no-console` rule to enforce use of logger instances
+* Include the unit's Modbus address in the device information
 
 ## 2.3.2
 
diff --git a/app/modbus.mjs b/app/modbus.mjs
index f12ebe5..25178c2 100644
--- a/app/modbus.mjs
+++ b/app/modbus.mjs
@@ -289,6 +289,12 @@ export const getDeviceInformation = async (modbusClient) => {
         'modelName': createModelNameString(deviceInformation),
     }
 
+    result = await mutex.runExclusive(async () => tryReadHoldingRegisters(modbusClient, 640, 1))
+    deviceInformation = {
+        ...deviceInformation,
+        'modbusAddress': result.data[0],
+    }
+
     return deviceInformation
 }