$ cd ~/iot/lesson10

$ python3 hash_value.py

$ python3 snakecoin.py

$ python3

>>> import hashlib

>>> m=hashlib.sha256(b"hello, world")

>>> m.hexdigest()

>>> m.digest_size

>>> m.block_size

>>> exit()

$

$ git clone https://github.com/satwikkansal/python_blockchain_app.git

$ export FLASK_APP=node_server.py

$ cd python_blockchain_app

$ flask run --port 8000

$ cd python_blockchain_app

$ python3 run_app.py

$ wget http://www.airspayce.com/mikem/bcm2835/bcm2835-1.60.tar.gz

$ tar zxvf bcm2835-1.60.tar.gz

$ cd bcm2835-1.60

$ ./configure

$ make

$ sudo make check

$ sudo make install

$ cd

$ git clone https://github.com/robertlie/dht11-raspi3.git

$ cd dht11-raspi3

$ npm install

$ nano mam_publish.js

$ nano mam_receive.js

$ nano mam_sensor.js

$ node mam_publish.js

$ node mam_receive.js YOUR_ROOT

$ nano sensor.js

$ nano mam_sensor.js

$ node sensor.js

$ node mam_sensor.js

$ node mam_receive.js YOUR_ROOT