add dependency for modbus driver
<artifactId>plc4j-driver-s7</artifactId>
<scope>runtime</scope>
</dependency>
+ <dependency>
+ <groupId>org.apache.plc4x</groupId>
+ <artifactId>plc4j-driver-modbus</artifactId>
+ <scope>runtime</scope>
+ </dependency>
<dependency>
<groupId>org.apache.pulsar</groupId>
<artifactId>pulsar-client</artifactId>
