Add initial version

default.nix

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+{ python3 }:
+with python3.pkgs;
+buildPythonPackage rec {
+  name = "mqtt-config";
+  src = ./.;
+  propagatedBuildInputs = [];
+  buildInputs = [ pyyaml paho-mqtt ];
+  doCheck = false;
+  shellHook = "";
+}

mqtt-config

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+#!/usr/bin/env python
+
+import argparse
+import yaml
+
+import paho.mqtt.publish
+
+
+def read_config(config_dict, base_topic=''):
+    ret = {}
+    for elem in config_dict:
+        if 'topic' not in elem:
+            raise Exception("Invalid config")
+        sep = '/' if base_topic else ''
+        topic = '{}{}{}'.format(base_topic.rstrip("/"), sep,
+                                elem["topic"].lstrip("/"))
+        if 'children' in elem:
+            ret.update(read_config(elem['children'], base_topic=topic))
+        if 'value' in elem:
+            ret[topic] = elem['value']
+    return ret
+
+
+def main():
+    options = argparse.ArgumentParser()
+    options.add_argument('--broker', '-b', default='localhost')
+    options.add_argument('--port', '-p', default='1883', type=int)
+    options.add_argument('config')
+    args = options.parse_args()
+
+    with open(args.config, 'r') as f:
+        config_dict = yaml.load(f, Loader=yaml.Loader)
+
+    topics = read_config(config_dict)
+
+    msgs = [(topic, value, 1, True) for topic, value in topics.items()]
+    paho.mqtt.publish.multiple(msgs,
+                               hostname=args.broker,
+                               port=args.port,
+                               client_id='configuration')
+
+
+if __name__ == '__main__':
+    main()

setup.py

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+#!/usr/bin/env python
+
+from distutils.core import setup
+
+setup(name='mqtt-config',
+      version='0.1',
+      description='MQTT Configurator',
+      author='0xee',
+      author_email='mqtt-config@0xee.eu',
+      packages=[],
+      scripts=['mqtt-config'])

shell.nix

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+{ pkgs ? import <nixpkgs> {} }:
+pkgs.callPackage ./. {}