103 lines
2.6 KiB
Markdown
103 lines
2.6 KiB
Markdown
# Adafruit MQTT Library example with support
|
|
|
|
This example illustrates Publish an arbitrary data packet using the Adafruit MQTT library to an MQTT feed which can then be parsed by the included python subscriber client.
|
|
|
|
---
|
|
|
|
## Installing and configuring Mosquitto broker (minimal working setup):
|
|
|
|
####_Installing on Raspberry Pi/Linux:_
|
|
|
|
```bash
|
|
sudo apt-get install mosquitto
|
|
cd /etc/mosquitto/
|
|
#See "Both" Setup Instructions Below
|
|
```
|
|
|
|
####_Installing On a Mac:_
|
|
```bash
|
|
brew install mosquitto
|
|
cd /usr/local/etc/mosquitto
|
|
#See "Both" Setup Instructions Below
|
|
```
|
|
|
|
---
|
|
|
|
####Configuring Mosquitto broker
|
|
```bash
|
|
sudo nano mosquitto.conf
|
|
```
|
|
Now we have to enable a password file to correctly interface with the Adafruit MQTT library. Scroll about two thirds of the way down until you see:
|
|
|
|
```bash
|
|
# -----------------------------------------------------------------
|
|
# Default authentication and topic access control
|
|
# -----------------------------------------------------------------
|
|
```
|
|
|
|
You should see `#password_file` about a paragraph after that.
|
|
Change
|
|
|
|
```bash
|
|
#password_file
|
|
```
|
|
|
|
To
|
|
|
|
```bash
|
|
password_file pwfile
|
|
```
|
|
|
|
Now `ctrl-x` to save and exit.
|
|
|
|
You're almost done! We just have to create and populate the password file we just configured. The default user info is:
|
|
* **Arduino Subscriber:**
|
|
* Username: TestUser
|
|
* Password: TestUser
|
|
|
|
* **Python Subscriber:**
|
|
* Username: TestPy
|
|
* Password: TestPy
|
|
|
|
```bash
|
|
touch pwfile #create the password file
|
|
mosquitto_passwd pwfile TestUser #Enter and confirm password when prompted
|
|
mosquitto_passwd pwfile TestPy #Enter and confirm password when prompted
|
|
```
|
|
|
|
####Running Mosquitto broker
|
|
Now run Mosquitto broker to allow Arduino publisher and Python subscriber to communicate
|
|
|
|
```bash
|
|
mosquitto
|
|
```
|
|
|
|
---
|
|
|
|
## Using Example Python Subscriber:
|
|
|
|
####Installing Python subscriber
|
|
Install dependencies if you haven't already
|
|
```bash
|
|
cd ../Adafruit_MQTT_Library/examples/mqtt_arbitrary_buffer/python_subscriber
|
|
pip install -r requirements.txt
|
|
```
|
|
|
|
|
|
####Installing Python subscriber
|
|
Run python script with default values and watch your parsed data print out.
|
|
```bash
|
|
python subscriber.py #Add -h flag to see modifiable options
|
|
```
|
|
|
|
Assuming that the Mosquitto broker is running in the background and the Adafruit_MQTT client (Arduino) is publishing, you should see the example data print out every 10 seconds.
|
|
|
|
```bash
|
|
MQTT: Connection successful
|
|
Connection successful
|
|
Subscribed to /feeds/arb_packet
|
|
Received char Array: "Hello!", val1: -4533, val2: 73102, val3: 3354...
|
|
Received char Array: "Hello!", val1: -4533, val2: 83611, val3: 3354...
|
|
Received char Array: "Hello!", val1: -4533, val2: 94115, val3: 3354...
|
|
```
|