Fix DPT13.

.vscode/launch.json

@@ -0,0 +1,25 @@
+{
+  // Use IntelliSense to learn about possible attributes.
+  // Hover to view descriptions of existing attributes.
+  // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+  "version": "0.2.0",
+  "configurations": [
+    {
+      "type": "node",
+      "request": "launch",
+      "name": "Mocha All",
+      "program": "${workspaceFolder}/node_modules/mocha/bin/_mocha",
+      "args": [
+          "-r",
+          "ts-node/register",
+          "--timeout",
+          "999999",
+          "--colors",
+          "${workspaceFolder}/tests/**/*.test.ts",
+      ],
+      "console": "integratedTerminal",
+      "internalConsoleOptions": "neverOpen",
+      "protocol": "inspector"
+  },
+  ]
+}

src/DPT13.ts

@@ -33,7 +33,8 @@ export class DPT13 implements DPT {
 
     if (value === undefined || value === null || !Number.isFinite(value))
       throw new InvalidValueError(`Value is not viable`)
-    if (Number.isInteger(value))
+
+    if (!Number.isInteger(value))
       throw new InvalidValueError(`Value ${value} is not an integer`)
 
     if (value < this.range[0] || value > this.range[1])