diff --git a/.github/workflows/container-image-build-validation.yaml b/.github/workflows/container-image-build-validation.yaml
index 59ebf0b..a03a545 100644
--- a/.github/workflows/container-image-build-validation.yaml
+++ b/.github/workflows/container-image-build-validation.yaml
@@ -38,6 +38,157 @@ jobs:
         with:
           name: container-build
           path: /tmp/container.tar
+
+  function-test-preparation:
+    name: Container functionality test preparation
+    runs-on: ubuntu-latest
+    permissions: write-all
+    steps:
+      - name: Checkout GIT repository
+        uses: actions/checkout@v4
+      - name: Log in to Github container registry
+        run: echo "${{ secrets.GITHUB_TOKEN }}" | docker login ghcr.io -u ${{ github.actor }} --password-stdin
+      - name: Build container for functionality test
+        uses: docker/build-push-action@v5
+        with:
+          push: true
+          load: false
+          context: .
+          file: ./Dockerfile
+          tags: ghcr.io/cybcon/modbus-client/modbus-client:test
+
+  function-test-execution:
+    name: Container functionality test execution
+    needs: function-test-preparation
+    runs-on: ubuntu-latest
+    services:
+      modbusserver:
+        image: oitc/modbus-server:latest
+        ports:
+          - 5020:5020
+    steps:
+      - name: Log in to Github container registry
+        run: echo "${{ secrets.GITHUB_TOKEN }}" | docker login ghcr.io -u ${{ github.actor }} --password-stdin
+      - name: Pull Modbus Client for functionality test
+        run: |
+          docker pull ghcr.io/cybcon/modbus-client/modbus-client:test
+          echo "# Modbus functionality test" >> ${GITHUB_STEP_SUMMARY}
+      - name: Get modbus server address
+        id: modbus-server-address
+        run: |
+          LOCAL_MACHINE=$(ifconfig -a eth0|grep inet|grep -v 127.0.0.1|grep -v inet6|awk '{print $2}'|tr -d "addr:")
+          echo "DEBUG: ${LOCAL_MACHINE}"
+          echo "ip=${LOCAL_MACHINE}" >> $GITHUB_OUTPUT
+      - name: Validate server endpoint
+        run: |
+          modbusserver=${{steps. modbus-server-address.outputs.ip}}
+          ping -c 1 -q ${modbusserver}
+          RC=$?
+          if [ ${RC} -gt 0 ]; then
+            echo "ERROR: Modbus slave not reachable" >&2
+            exit 1
+          fi
+      - name: Test Discrete Output Coils
+        run: |
+          modbusserver=${{steps. modbus-server-address.outputs.ip}}
+          echo "## Get Discrete Output Coils" >> ${GITHUB_STEP_SUMMARY}
+          echo '<details>' >> ${GITHUB_STEP_SUMMARY}
+          echo '  <summary>Test output details</summary>' >> ${GITHUB_STEP_SUMMARY}
+          echo "" >> ${GITHUB_STEP_SUMMARY}
+          echo '  ```' >> ${GITHUB_STEP_SUMMARY}
+          echo "  docker run --rm ghcr.io/cybcon/modbus-client/modbus-client:test -s ${modbusserver} -p 5020 -t 1 -r 0 -l 10" >> ${GITHUB_STEP_SUMMARY}
+          docker run --rm ghcr.io/cybcon/modbus-client/modbus-client:test -s ${modbusserver} -p 5020 -t 1 -r 0 -l 10 > output.tmp 2>&1
+          cat output.tmp | while read line
+          do
+            echo "  ${line}" >> ${GITHUB_STEP_SUMMARY}
+          done
+          echo '  ```' >> ${GITHUB_STEP_SUMMARY}
+          echo '</details>' >> ${GITHUB_STEP_SUMMARY}
+          echo "" >> ${GITHUB_STEP_SUMMARY}
+          # analyze output
+          RESULT=$(cat output.tmp | grep ^2 | awk '{print $3}')
+          if [ "${RESULT}" == "False" ]; then
+            echo "Test succesfull :white_check_mark:" >> ${GITHUB_STEP_SUMMARY}
+          else
+            echo "Test failed :x:" >> ${GITHUB_STEP_SUMMARY}
+            exit 1
+          fi
+      - name: Test Discrete Input Contacts
+        run: |
+          modbusserver=${{steps. modbus-server-address.outputs.ip}}
+          echo "## Get Discrete Input Contacts" >> ${GITHUB_STEP_SUMMARY}
+          echo '<details>' >> ${GITHUB_STEP_SUMMARY}
+          echo '  <summary>Test output details</summary>' >> ${GITHUB_STEP_SUMMARY}
+          echo "" >> ${GITHUB_STEP_SUMMARY}
+          echo '  ```' >> ${GITHUB_STEP_SUMMARY}
+          echo "  docker run --rm ghcr.io/cybcon/modbus-client/modbus-client:test -s ${modbusserver} -p 5020 -t 2 -r 0 -l 10" >> ${GITHUB_STEP_SUMMARY}
+          docker run --rm ghcr.io/cybcon/modbus-client/modbus-client:test -s ${modbusserver} -p 5020 -t 2 -r 0 -l 10 > output.tmp 2>&1
+          cat output.tmp | while read line
+          do
+            echo "  ${line}" >> ${GITHUB_STEP_SUMMARY}
+          done
+          echo '  ```' >> ${GITHUB_STEP_SUMMARY}
+          echo '</details>' >> ${GITHUB_STEP_SUMMARY}
+          echo "" >> ${GITHUB_STEP_SUMMARY}
+          # analyze output
+          RESULT=$(cat output.tmp | grep ^10002 | awk '{print $3}')
+          if [ "${RESULT}" == "False" ]; then
+            echo "Test succesfull :white_check_mark:" >> ${GITHUB_STEP_SUMMARY}
+          else
+            echo "Test failed :x:" >> ${GITHUB_STEP_SUMMARY}
+            exit 1
+          fi
+      - name: Test Analog Output Holding Register
+        run: |
+          modbusserver=${{steps. modbus-server-address.outputs.ip}}
+          echo "## Get Analog Output Holding Register" >> ${GITHUB_STEP_SUMMARY}
+          echo '<details>' >> ${GITHUB_STEP_SUMMARY}
+          echo '  <summary>Test output details</summary>' >> ${GITHUB_STEP_SUMMARY}
+          echo "" >> ${GITHUB_STEP_SUMMARY}
+          echo '  ```' >> ${GITHUB_STEP_SUMMARY}
+          echo "  docker run --rm ghcr.io/cybcon/modbus-client/modbus-client:test -s ${modbusserver} -p 5020 -t 3 -r 0 -l 10" >> ${GITHUB_STEP_SUMMARY}
+          docker run --rm ghcr.io/cybcon/modbus-client/modbus-client:test -s ${modbusserver} -p 5020 -t 3 -r 0 -l 10 > output.tmp 2>&1
+          cat output.tmp | while read line
+          do
+            echo "  ${line}" >> ${GITHUB_STEP_SUMMARY}
+          done
+          echo '  ```' >> ${GITHUB_STEP_SUMMARY}
+          echo '</details>' >> ${GITHUB_STEP_SUMMARY}
+          echo "" >> ${GITHUB_STEP_SUMMARY}
+          # analyze output
+          RESULT=$(cat output.tmp | grep ^40002 | awk '{print $2}')
+          if [ "${RESULT}" == "0x0000" ]; then
+            echo "Test succesfull :white_check_mark:" >> ${GITHUB_STEP_SUMMARY}
+          else
+            echo "Test failed :x:" >> ${GITHUB_STEP_SUMMARY}
+            exit 1
+          fi
+      - name: Test Analog Input Register
+        run: |
+          modbusserver=${{steps. modbus-server-address.outputs.ip}}
+          echo "## Get Analog Input Register" >> ${GITHUB_STEP_SUMMARY}
+          echo '<details>' >> ${GITHUB_STEP_SUMMARY}
+          echo '  <summary>Test output details</summary>' >> ${GITHUB_STEP_SUMMARY}
+          echo "" >> ${GITHUB_STEP_SUMMARY}
+          echo '  ```' >> ${GITHUB_STEP_SUMMARY}
+          echo "  docker run --rm ghcr.io/cybcon/modbus-client/modbus-client:test -s ${modbusserver} -p 5020 -t 4 -r 0 -l 10" >> ${GITHUB_STEP_SUMMARY}
+          docker run --rm ghcr.io/cybcon/modbus-client/modbus-client:test -s ${modbusserver} -p 5020 -t 4 -r 0 -l 10 > output.tmp 2>&1
+          cat output.tmp | while read line
+          do
+            echo "  ${line}" >> ${GITHUB_STEP_SUMMARY}
+          done
+          echo '  ```' >> ${GITHUB_STEP_SUMMARY}
+          echo '</details>' >> ${GITHUB_STEP_SUMMARY}
+          echo "" >> ${GITHUB_STEP_SUMMARY}
+          # analyze output
+          RESULT=$(cat output.tmp | grep ^30002 | head -1 | awk '{print $2}')
+          if [ "${RESULT}" == "0x0000" ]; then
+            echo "Test succesfull :white_check_mark:" >> ${GITHUB_STEP_SUMMARY}
+          else
+            echo "Test failed :x:" >> ${GITHUB_STEP_SUMMARY}
+            exit 1
+          fi
+
   scan:
     name: Container vulnerability scan
     needs: container-build
diff --git a/Dockerfile b/Dockerfile
index d3c342c..812514d 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,7 +1,7 @@
-FROM alpine:3.18.4 AS base
+FROM alpine:3.18.8 AS base
 RUN apk upgrade --available --no-cache --update \
     && apk add --no-cache --update \
-       python3=3.11.6-r0 \
+       python3=3.11.8-r1 \
        py3-pip=23.1.2-r0 \
     # Cleanup APK
     && rm -rf /var/cache/apk/* /tmp/* /var/tmp/*
@@ -12,7 +12,7 @@ RUN apk upgrade --available --no-cache --update \
 FROM base as builder
 RUN apk add --no-cache --update \
       g++=12.2.1_git20220924-r10 \
-      python3-dev=3.11.6-r0 \
+      python3-dev=3.11.8-r1 \
     && ln -s /usr/include/locale.h /usr/include/xlocale.h
 COPY --chown=root:root FloatToHex /FloatToHex
 
@@ -26,7 +26,7 @@ RUN python3 setup.py install
 # Building the docker image with already compiled modules
 FROM base
 LABEL maintainer="Michael Oberdorf IT-Consulting <info@oberdorf-itc.de>"
-LABEL site.local.program.version="1.0.14"
+LABEL site.local.program.version="1.0.15"
 
 COPY --from=builder /usr/lib/python3.11/site-packages /usr/lib/python3.11/site-packages
 
diff --git a/README.md b/README.md
index 0120fe4..7cc001a 100644
--- a/README.md
+++ b/README.md
@@ -8,7 +8,8 @@ Container Registry: [DockerHub](https://hub.docker.com/r/oitc/modbus-client)
 
 # Supported tags and respective `Dockerfile` links
 
-* [`latest`, `1.0.14`](https://github.com/cybcon/modbus-client/blob/v1.0.14/Dockerfile)
+* [`latest`, `1.0.15`](https://github.com/cybcon/modbus-client/blob/v1.0.15/Dockerfile)
+* [`1.0.14`](https://github.com/cybcon/modbus-client/blob/v1.0.14/Dockerfile)
 * [`1.0.13`](https://github.com/cybcon/modbus-client/blob/v1.0.13/Dockerfile)
 * [`1.0.12`](https://github.com/cybcon/modbus-client/blob/v1.0.12/Dockerfile)
 * [`1.0.11`](https://github.com/cybcon/modbus-client/blob/v1.0.11/Dockerfile)
diff --git a/src/app/modbus_client.py b/src/app/modbus_client.py
index 6181e69..f92a056 100644
--- a/src/app/modbus_client.py
+++ b/src/app/modbus_client.py
@@ -18,7 +18,7 @@
 import FloatToHex
 from numpy import little_endian
 
-VERSION='1.0.14'
+VERSION='1.0.15'
 DEBUG=False
 """
 ###############################################################################