MQTT + PROTOCOL BUFFERS + ESP8266 + LINUX DOCKER

starting from a fresh debian/ubuntu/raspbian container

begin by installing these packages as :

apt update

apt upgrade

apt install git cmake make g++ autoconf automake libtool curl unzip python  python-dev python-pip  python3 python3-dev python3-pip mosquitto mosquitto-dev libmosquittopp-dev arduino

install protocol buffers from source

git clone https://github.com/protocolbuffers/protobuf.git
// 
cd protobuf
git submodule update --init --recursive
./autogen.sh
 
./configure --prefix=/usr
make
make check
make install
ldconfig # refresh shared library cache.

then within python install:

pip install python3-protobuf protobuf paho-mqtt
pip3 install python3-protobuf protobuf paho-mqtt

Now pull the Mqtt_Protobuf demo and build

cd /
git clone https://github.com/Kelvin-Weksa/Mqtt_Protobuf.git
cd Mqtt_Protobuf
git submodule init
git submodule update
mkdir build #the build folder MUST be named 'build'
cd build/
cmake ..
make

from the witin build/ folder open terminal and access the C++ app as

./cpp/cpp broker_ip subscribe_to publish_to

from the witin build/ folder open terminal and access the python3 app as

python3 ../python/paho_mqtt.py broker_ip subscribe_to publish_to

from the witin build/ folder open terminal and compile the esp8266 app as

./../arduino-cli compile --fqbn esp8266:esp8266:generic  ../Mqtt_Protobuf_Sketch/

from the witin build/ folder open terminal and upload/monitor the esp8266 app as

./../arduino-cli upload -p /dev/ttyUSB0 --fqbn esp8266:esp8266:generic ../Mqtt_Protobuf_Sketch/ && stty -F /dev/ttyUSB0 raw 115200 && cat /dev/ttyUSB0

of course assuming the esp8266 is located at: /dev/ttyUSB0

change as appropriate see arduino-cli

how to run the docker so as to have access to host network and chosen usb devices

docker run -it --device=/dev/ttyUSB0 --device=/dev/ttyACM0 --net=host kelvinwekesa/debian-mosquitto:final

the folder structure is as follows

• build: this is where the built application and generated files are located it MUST be named "build"

• cpp: c++ program to subscribe and publish messages

• examples: collection of working code snippets not related to our project

• fmt: 3rd party libraly, unmodified

• messages: CMakefile to build protobuf and generate c++ code

• messages_embedded: CMakefile to build protobuf and generate arduino code

• Mqtt_Protobuf_Sketch: Arduono code to subscribe and publish messages

• MQTT_Publish: example code from recomended starter projec, unmodified

• MQTT_Subscribe: example code from recomended starter project, unmodified

• nanopb: 3rd party library, unmodified

• protobuf_examples: example protobuf tutorial, not related to our project

• python: Python script to subscribe and publish messages

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