diff --git a/packages/binding-modbus/src/modbus-client.ts b/packages/binding-modbus/src/modbus-client.ts
index 8074d2107..b2c30e084 100644
--- a/packages/binding-modbus/src/modbus-client.ts
+++ b/packages/binding-modbus/src/modbus-client.ts
@@ -150,7 +150,7 @@ export default class ModbusClient implements ProtocolClient {
         const parsed = new URL(form.href);
         const port = parsed.port ? parseInt(parsed.port, 10) : DEFAULT_PORT;
         let body;
-        if (content) {
+        if (content != null) {
             body = await content.toBuffer();
         }
         const formValidated = this.validateAndFillDefaultForm(form, body?.byteLength);
@@ -160,7 +160,7 @@ export default class ModbusClient implements ProtocolClient {
         const host = parsed.hostname;
         const hostAndPort = host + ":" + port;
 
-        if (body) {
+        if (body != null) {
             this.validateBufferLength(formValidated, body);
         }
 
diff --git a/packages/binding-mqtt/src/mqtt-broker-server.ts b/packages/binding-mqtt/src/mqtt-broker-server.ts
index bd5862c14..b6a176071 100644
--- a/packages/binding-mqtt/src/mqtt-broker-server.ts
+++ b/packages/binding-mqtt/src/mqtt-broker-server.ts
@@ -146,7 +146,7 @@ export default class MqttBrokerServer implements ProtocolServer {
         const topic = encodeURIComponent(name) + "/properties/" + encodeURIComponent(propertyName);
         const property = thing.properties[propertyName];
 
-        const writeOnly = property.writeOnly ?? false;
+        const writeOnly: boolean = property.writeOnly ?? false;
         if (!writeOnly) {
             const href = this.brokerURI + "/" + topic;
             const form = new TD.Form(href, ContentSerdes.DEFAULT);
@@ -167,7 +167,7 @@ export default class MqttBrokerServer implements ProtocolServer {
             };
             thing.handleObserveProperty(propertyName, observeListener, { formIndex: property.forms.length - 1 });
         }
-        const readOnly = property.readOnly ?? false;
+        const readOnly: boolean = property.readOnly ?? false;
         if (!readOnly) {
             const href = this.brokerURI + "/" + topic + "/writeproperty";
             this.broker.subscribe(topic + "/writeproperty");
@@ -236,7 +236,7 @@ export default class MqttBrokerServer implements ProtocolServer {
             // connecting to the actions
             debug(`MqttBrokerServer at ${this.brokerURI} received message for '${receivedTopic}'`);
             const thing = this.things.get(segments[this.THING_NAME_SEGMENT_INDEX]);
-            if (thing) {
+            if (thing != null) {
                 if (segments[this.INTERACTION_TYPE_SEGMENT_INDEX] === "actions") {
                     const action = thing.actions[segments[this.INTERACTION_NAME_SEGMENT_INDEX]];
                     if (action != null) {
@@ -251,7 +251,7 @@ export default class MqttBrokerServer implements ProtocolServer {
         ) {
             // connecting to the writeable properties
             const thing = this.things.get(segments[this.THING_NAME_SEGMENT_INDEX]);
-            if (thing) {
+            if (thing != null) {
                 if (segments[this.INTERACTION_TYPE_SEGMENT_INDEX] === "properties") {
                     const property = thing.properties[segments[this.INTERACTION_NAME_SEGMENT_INDEX]];
                     if (property != null) {
@@ -364,7 +364,7 @@ export default class MqttBrokerServer implements ProtocolServer {
             }
         }
 
-        if (removedThing) {
+        if (removedThing != null) {
             info(`MqttBrokerServer succesfully destroyed '${removedThing.title}'`);
         } else {
             info(`MqttBrokerServer failed to destroy thing with thingId '${thingId}'`);
diff --git a/packages/binding-mqtt/test/mqtt-client-subscribe-test.integration.ts b/packages/binding-mqtt/test/mqtt-client-subscribe-test.integration.ts
index e3d2fbbb0..70b7aad8d 100644
--- a/packages/binding-mqtt/test/mqtt-client-subscribe-test.integration.ts
+++ b/packages/binding-mqtt/test/mqtt-client-subscribe-test.integration.ts
@@ -76,7 +76,7 @@ describe("MQTT client implementation", () => {
                                 if (!eventReceived) {
                                     eventReceived = true;
                                 } else {
-                                    if (!x.data) {
+                                    if (x.data == null) {
                                         done(new Error("No data received"));
                                         return;
                                     }
@@ -138,7 +138,7 @@ describe("MQTT client implementation", () => {
                                 if (!eventReceived) {
                                     eventReceived = true;
                                 } else {
-                                    if (!x.data) {
+                                    if (x.data == null) {
                                         done(new Error("No data received"));
                                         return;
                                     }
diff --git a/packages/binding-opcua/src/opcua-protocol-client.ts b/packages/binding-opcua/src/opcua-protocol-client.ts
index 80d794a83..2df14aa2a 100644
--- a/packages/binding-opcua/src/opcua-protocol-client.ts
+++ b/packages/binding-opcua/src/opcua-protocol-client.ts
@@ -151,7 +151,8 @@ export class OPCUAProtocolClient implements ProtocolClient {
 
     private async _withConnection<T>(form: OPCUAForm, next: (connection: OPCUAConnection) => Promise<T>): Promise<T> {
         const endpoint = form.href;
-        if (!endpoint || !endpoint.match(/^opc.tcp:\/\//)) {
+        const matchesScheme: boolean = endpoint?.match(/^opc.tcp:\/\//) != null;
+        if (!matchesScheme) {
             debug(`invalid opcua:endpoint ${endpoint} specified`);
             throw new Error("Invalid OPCUA endpoint " + endpoint);
         }
diff --git a/packages/binding-websockets/src/ws-server.ts b/packages/binding-websockets/src/ws-server.ts
index 9672ab739..a2b85d3a7 100644
--- a/packages/binding-websockets/src/ws-server.ts
+++ b/packages/binding-websockets/src/ws-server.ts
@@ -178,8 +178,8 @@ export default class WebSocketServer implements ProtocolServer {
                     const form = new TD.Form(href, ContentSerdes.DEFAULT);
                     const ops = [];
 
-                    const writeOnly = property.writeOnly ?? false;
-                    const readOnly = property.readOnly ?? false;
+                    const writeOnly: boolean = property.writeOnly ?? false;
+                    const readOnly: boolean = property.readOnly ?? false;
 
                     if (!writeOnly) {
                         ops.push("readproperty", "observeproperty", "unobserveproperty");
@@ -209,7 +209,8 @@ export default class WebSocketServer implements ProtocolServer {
                         }
                     };
 
-                    if (property.writeOnly ?? false) {
+                    const writeOnly: boolean = property.writeOnly ?? false;
+                    if (writeOnly) {
                         for (let formIndex = 0; formIndex < thing.properties[propertyName].forms.length; formIndex++) {
                             thing
                                 .handleObserveProperty(propertyName, observeListener, { formIndex })