humidity: Add simulator.js

API could be renamed to readHumidity to align some drivers

Relate-to: #13
Change-Id: I0b26199d4384e8aab9fd0894ded26664fe50663a
Signed-off-by: Philippe Coval <[email protected]>

lib/humidity/simulator.js

@@ -0,0 +1,44 @@
+/* -*- mode: js; js-indent-level:2; -
+ * SPDX-License-Identifier: Apache-2.0
+ * Copyright 2020-present Philippe Coval and other contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+'use strict';
+
+var console = require('console');
+
+function Simulator () {
+  this.value = {
+    level: 100.
+  };
+}
+
+Simulator.prototype.read = function (callback) {
+  this.value.level = Math.random();
+  if (callback) return callback(null, this.value);
+};
+
+module.exports = Simulator;
+
+if (module.parent === null) {
+  var sensor = new Simulator();
+  sensor.read(function (err, value) {
+    if (err) {
+      console.error('error: ' + err);
+      throw err;
+    } else {
+      console.log('log: value=' + JSON.stringify(value));
+    }
+  });
+}