Add MQTT Support

.github/workflows/commitlint.yml

@@ -0,0 +1,13 @@
+name: Lint Commit Messages
+
+on:
+  pull_request:
+
+jobs:
+  commitlint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+      - uses: wagoid/commitlint-github-action@v5

.github/workflows/release.yml

@@ -10,14 +10,14 @@ jobs:
   generate-release:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - name: Set package version
         run: |
           export VERSION=$(echo $GITHUB_REF | sed 's/refs\/tags\/v//')
           echo "VERSION set to $VERSION"
           echo VERSION = \'$VERSION\' > filament_scale_enhanced/fse_version.py
       - name: Setup Python
-        uses: actions/setup-python@v2
+        uses: actions/setup-python@v4
         with:
           python-version: 3.8
       - name: Install OctoPrint
@@ -39,4 +39,4 @@ jobs:
           draft: false
           files: |
             LICENSE.txt
-            dist/Filament_Scale_Enhanced.zip
+            dist/Filament_Scale_Enhanced.zip

.github/workflows/test.yml

@@ -10,9 +10,9 @@ jobs:
   test:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - name: Setup Python
-        uses: actions/setup-python@v2
+        uses: actions/setup-python@v4
         with:
           python-version: 3.8
       - name: Install OctoPrint

README.md

@@ -24,6 +24,15 @@ or manually using this URL:
 
 Once you have wired up the HX711, it must be calibrated. This is a pretty straightforward process, and all you will need is an object of known weight. Attach the load cell to your printer with the printed bracket, then follow the instructions on the plugin's settings page.
 
+## MQTT
+
+If you would like weight messages published via MQTT, install and configure [Octoprint-MQTT](https://plugins.octoprint.org/plugins/mqtt/)
+
+Once it's configured correctly, this library will automatically detect it and start publishing messages in the following format:
+```
+baseTopic/plugin/filament_scale/filament_weight 171
+```
+
 ## Troubleshooting
 
 `NaN` may be occasionally displayed in the interface when the weight can't be read correctly. The cheap boards vary in quality and are a little sensitive to vibration/power stability. Ensure the cabling is secure, you have a sufficiently sized load cell, and a good power supply.
@@ -39,4 +48,4 @@ pip install OctoPrint Mock.GPIO
 pip install ".[development]"
 ```
 
-Running Tests: `pytest -v`
+Running Tests: `pytest -v`

commitlint.config.js

@@ -0,0 +1,8 @@
+const Configuration = {
+    extends: ['@commitlint/config-conventional'],
+    rules: {
+        'subject-case': [1, 'never'],
+    },
+}
+
+module.exports = Configuration

filament_scale_enhanced/__init__.py

@@ -7,60 +7,115 @@
 from .hx711 import HX711
 
 try:
-    import RPi.GPIO as GPIO
+    from RPi import GPIO
 except (ModuleNotFoundError, RuntimeError):
-    import Mock.GPIO as GPIO  # noqa: F401
+    from Mock import GPIO  # noqa: F401
 
 
 # pylint: disable=too-many-ancestors
-class FilamentScalePlugin(octoprint.plugin.SettingsPlugin,
-                          octoprint.plugin.AssetPlugin,
-                          octoprint.plugin.TemplatePlugin,
-                          octoprint.plugin.StartupPlugin):
+class FilamentScalePlugin(
+    octoprint.plugin.SettingsPlugin,
+    octoprint.plugin.AssetPlugin,
+    octoprint.plugin.TemplatePlugin,
+    octoprint.plugin.StartupPlugin,
+):
 
     hx = None
     t = None
+    tq = None
 
     @staticmethod
-    def get_template_configs():
-        return [
-            dict(type="settings", custom_bindings=True)
-        ]
+    def get_template_configs():  # pylint: disable=arguments-differ
+        return [{"type": "settings", "custom_bindings": True}]
 
     @staticmethod
-    def get_settings_defaults():
-        return dict(
-            tare=8430152,
-            reference_unit=-411,
-            spool_weight=200,
-            clockpin=21,
-            datapin=20,
-            lastknownweight=0
-        )
+    def get_settings_defaults():  # pylint: disable=arguments-differ
+        return {
+            "tare": 8430152,
+            "reference_unit": -411,
+            "spool_weight": 200,
+            "clockpin": 21,
+            "datapin": 20,
+            "lastknownweight": 0,
+        }
 
     @staticmethod
-    def get_assets():
-        return dict(
-            js=["js/filament_scale.js"],
-            css=["css/filament_scale.css"],
-            less=["less/filament_scale.less"]
-        )
+    def get_assets():  # pylint: disable=arguments-differ
+        return {
+            "js": ["js/filament_scale.js"],
+            "css": ["css/filament_scale.css"],
+            "less": ["less/filament_scale.less"],
+        }
+
+    def __init__(self):
+        super().__init__()
+        self.mqtt_publish = lambda *args, **kwargs: None
+        self.mqtt = False
+        self.mqtt_topic = ''
+        self.last_weight = 0
+        self.last_sent_weight = -1
 
     def on_startup(self, host, port):  # pylint: disable=unused-argument
-        self.hx = HX711(20, 21)
-        self.hx.set_reading_format("LSB", "MSB")
-        self.hx.reset()
-        self.hx.power_up()
-        self.t = octoprint.util.RepeatedTimer(3.0, self.check_weight)
-        self.t.start()
+        try:
+            self.hx = HX711(20, 21)
+            self.hx.set_reading_format("LSB", "MSB")
+            self.hx.reset()
+            self.hx.power_up()
+            self.t = octoprint.util.RepeatedTimer(3.0, self.check_weight)
+            self.t.start()
+            self.tq = octoprint.util.RepeatedTimer(10.0, self.send_weight_mqtt)
+            self.tq.start()
+        except Exception as err:  # pylint: disable=broad-exception-caught
+            self._logger.exception(err)
+
+    def on_after_startup(self):
+        helpers = self._plugin_manager.get_helpers("mqtt", "mqtt_publish")
+        if not helpers or "mqtt_publish" not in helpers:
+            self._logger.debug(
+                "MQTT plugin helpers not found scale value will not be published"
+            )
+            return
 
-    def check_weight(self):
-        self.hx.power_up()
-        v = self.hx.read()
-        self._plugin_manager.send_plugin_message(self._identifier, v)
-        self.hx.power_down()
+        base_topic = self._settings.global_get(
+            ["plugins", "mqtt", "publish", "baseTopic"]
+        )
+        self.mqtt_topic = f"{base_topic.rstrip('/')}/plugin/{self._identifier}"
+        self._logger.debug("Topic: %s", self.mqtt_topic)
 
-    # pylint: disable=line-too-long
+        self.mqtt_publish = helpers["mqtt_publish"]
+        self.mqtt = True
+        self._logger.debug(
+            "MQTT plugIn Helpers Found. Scale value will be published"
+        )
+
+    def real_weight(self) -> int:
+        tare = self._settings.get(["tare"])
+        reference = self._settings.get(["reference_unit"])
+        spool = self._settings.get(["spool_weight"])
+        weight = (self.last_weight - tare) / reference
+        return int(weight) - int(spool)
+
+    def send_weight_mqtt(self):
+        if not self.mqtt:
+            return
+        real_weight = self.real_weight()
+        if real_weight == self.last_sent_weight:
+            return
+        self.last_sent_weight = real_weight
+        self.mqtt_publish(f'{self.mqtt_topic}/filament_weight', str(real_weight))
+
+    def check_weight(self):
+        self._logger.debug("Begin hxRead")
+        try:
+            self.hx.power_up()
+            v = self.hx.read_average()
+            self.last_weight = v
+            self._plugin_manager.send_plugin_message(self._identifier, v)
+            self.hx.power_down()
+        except Exception as err:  # pylint: disable=broad-exception-caught
+            self._logger.exception(err)
+
+    # pylint: disable=line-too-long,use-dict-literal
     def get_update_information(self):
         # Define the configuration for your plugin to use with the
         # Software Update Plugin here.
@@ -70,15 +125,13 @@ def get_update_information(self):
             filament_scale=dict(
                 displayName="Filament Scale Plugin",
                 displayVersion=self._plugin_version,
-
                 # version check: github repository
                 type="github_release",
                 user="techman83",
                 repo="Filament-Scale-Enhanced",
                 current=self._plugin_version,
-
                 # update method: pip
-                pip="https://github.com/techman83/Filament-Scale-Enhanced/releases/latest/download/Filament_Scale_Enhanced.zip"  # noqa: E501
+                pip="https://github.com/techman83/Filament-Scale-Enhanced/releases/latest/download/Filament_Scale_Enhanced.zip",  # noqa: E501
             )
         )
 

filament_scale_enhanced/hx711.py

@@ -2,9 +2,9 @@
 import statistics
 
 try:
-    import RPi.GPIO as GPIO
+    from RPi import GPIO
 except (ModuleNotFoundError, RuntimeError):
-    import Mock.GPIO as GPIO
+    from Mock import GPIO
 
 
 def bitsToBytes(a):

pytest.ini

@@ -1,3 +1,7 @@
 [pytest]
 python_files = tests/__init__.py
 addopts = -p no:cacheprovider --mypy --pylint --flake8
+filterwarnings =
+    ignore
+    default:::filament_scale.*
+    default:::tests.*

setup.py

@@ -4,7 +4,7 @@
 from setuptools import setup
 
 version = {}
-with open("filament_scale_enhanced/fse_version.py") as fp:
+with open("filament_scale_enhanced/fse_version.py", encoding="utf8") as fp:
     exec(fp.read(), version)  # pylint: disable=exec-used
 
 try:
@@ -38,7 +38,9 @@
         'pytest-pylint',
         'pylint',
         'pytest-flake8',
-        'Mock.GPIO'
+        'Mock.GPIO',
+        # Flake8 is likely a dead end
+        'flake8<5',
     ],
     'test': [
         'pytest',
@@ -47,7 +49,9 @@
         'pytest-pylint',
         'pylint',
         'pytest-flake8',
-        'Mock.GPIO'
+        'Mock.GPIO',
+        # Flake8 is likely a dead end
+        'flake8<5',
     ]
 }