commit 2b5c99e0cd3a93d1a3cdb006d42020e3e2efee8a
Author: Ben Roberts <me@benroberts.net>
Date:   Sun Sep 6 00:10:50 2020 +0100

    Initial version

diff --git a/energy_usage/__init__.py b/energy_usage/__init__.py
new file mode 100644
index 0000000..72bdd01
--- /dev/null
+++ b/energy_usage/__init__.py
@@ -0,0 +1 @@
+VERSION = "0.1"
diff --git a/energy_usage/config_default.yaml b/energy_usage/config_default.yaml
new file mode 100644
index 0000000..35d304c
--- /dev/null
+++ b/energy_usage/config_default.yaml
@@ -0,0 +1,6 @@
+---
+ca_certs: /etc/ssl/certs/ca-certificates.crt
+debug: false
+mqtt:
+  server: glowmqtt.energyhive.com
+  port: 8883
diff --git a/energy_usage/influx_client.py b/energy_usage/influx_client.py
new file mode 100644
index 0000000..937df60
--- /dev/null
+++ b/energy_usage/influx_client.py
@@ -0,0 +1,17 @@
+from influxdb import InfluxDBClient
+
+
+class InfluxClient:
+    def __init__(self, server, port, database):
+        self.server = server
+        self.port = port
+        self.database = database
+
+        self.client = InfluxDBClient(
+            host=self.server,
+            port=self.port,
+            database=self.database)
+
+    def write_points(self, body):
+        self.client.write_points(body)
+
diff --git a/energy_usage/main.py b/energy_usage/main.py
new file mode 100644
index 0000000..9c85a43
--- /dev/null
+++ b/energy_usage/main.py
@@ -0,0 +1,107 @@
+import argparse
+import logging
+import os
+import queue
+import sys
+
+import confuse
+
+from energy_usage.influx_client import InfluxClient
+from energy_usage.mqtt_client import MqttClient
+from energy_usage.sep import parse_sep, usage_to_datapoints
+
+
+def parse_args(arg_str=None):
+    if arg_str is None:
+        arg_str = sys.argv[1:]
+
+    parser = argparse.ArgumentParser('energy-usage')
+
+    parser.add_argument(
+        '-d', '--debug', dest='debug', action='store_true',
+        help='Enable debug output')
+    parser.add_argument(
+        '-n', '--noop', dest='noop', action='store_true',
+        help="Don't make any modifications, just show what would be done")
+
+    args = parser.parse_args(arg_str)
+
+    return parser.prog, args
+
+
+def load_config(args):
+    config = confuse.Configuration('energy-usage', 'energy_usage')
+    config.set_args(args)
+
+    validate_config(config)
+
+    return config
+
+
+def validate_config(config):
+    required = [
+        (config['mqtt']['username'], str),
+        (config['mqtt']['password'], str),
+        (config['mqtt']['topic'], str)
+    ]
+
+    for item in required:
+        key, datatype = item
+        key.get(datatype)
+
+
+def setup_logging(prog, config):
+    logger = logging.getLogger()
+
+    if config['debug'].get(bool):
+        logger.setLevel(logging.DEBUG)
+    else:
+        logger.setLevel(logging.INFO)
+
+    handler = logging.StreamHandler(sys.stdout)
+    formatter = logging.Formatter('{0}[{1}]: %(levelname)s %(message)s'.format(prog, str(os.getpid())))
+    handler.setFormatter(formatter)
+    logger.addHandler(handler)
+
+    return logger
+
+
+def main():
+    prog, args = parse_args()
+
+    config = load_config(args)
+
+    logger = setup_logging(prog, config)
+
+    msg_q = queue.Queue()
+
+    mqtt_client = MqttClient(
+        server=config['mqtt']['server'].get(str),
+        port=config['mqtt']['port'].get(int),
+        username=config['mqtt']['username'].get(str),
+        password=config['mqtt']['password'].get(str),
+        topic=config['mqtt']['topic'].get(str),
+        ca_certs=config['ca_certs'].get(str),
+        msg_q=msg_q)
+    mqtt_client.connect()
+    mqtt_client.run()
+
+    influx_client = InfluxClient(
+        server=config['influx']['server'].get(str),
+        port=config['influx']['port'].get(int),
+        database='default',
+    )
+
+    while True:
+        try:
+            msg = msg_q.get()
+            logger.debug(msg.topic + " " + str(msg.payload))
+            usage = parse_sep(msg.topic, msg.payload)
+            usage_datapoints = usage_to_datapoints(usage)
+            influx_client.write_points(usage_datapoints)
+        except KeyboardInterrupt:
+            break
+
+
+if __name__ == '__main__':
+    main()
diff --git a/energy_usage/mqtt_client.py b/energy_usage/mqtt_client.py
new file mode 100644
index 0000000..ff002c4
--- /dev/null
+++ b/energy_usage/mqtt_client.py
@@ -0,0 +1,46 @@
+import logging
+
+import paho.mqtt.client as mqtt
+
+class MqttClient:
+    def __init__(self, server, port, username, password, topic, ca_certs, msg_q):
+        self.username = username
+        self.password = password
+        self.topic = topic
+        self.ca_certs = ca_certs
+        self.server = server
+        self.port = port
+        self.msg_q = msg_q
+
+        self.logger = logging.getLogger(__name__)
+
+        self.client = mqtt.Client()
+        self.client.on_connect = self.on_connect
+        self.client.on_message = self.on_message
+
+    def __del__(self):
+        self.client.loop_stop()
+
+    def connect(self):
+        self.client.username_pw_set(self.username, password=self.password)
+        self.client.tls_set(ca_certs=self.ca_certs)
+        self.client.connect(self.server, self.port, 60)
+
+    def run(self):
+        # Blocking call that processes network traffic, dispatches callbacks and
+        # handles reconnecting.
+        # Other loop*() functions are available that give a threaded interface and a
+        # manual interface.
+        self.client.loop_start()
+
+    # The callback for when the client receives a CONNACK response from the server.
+    def on_connect(self, client, userdata, flags, rc):
+        self.logger.info("Connected with result code " + str(rc))
+
+        # Subscribing in on_connect() means that if we lose the connection and
+        # reconnect then subscriptions will be renewed.
+        client.subscribe(self.topic)
+
+    # The callback for when a PUBLISH message is received from the server.
+    def on_message(self, client, userdata, msg):
+        self.msg_q.put(msg)
diff --git a/energy_usage/sep.py b/energy_usage/sep.py
new file mode 100644
index 0000000..f6af82a
--- /dev/null
+++ b/energy_usage/sep.py
@@ -0,0 +1,84 @@
+""" SEP protocol parser
+"""
+import datetime
+import json
+
+
+def parse_sep(topic, payload_str):
+    """
+    
+    Credit to https://gist.github.com/ndfred/b373eeafc4f5b0870c1b8857041289a9
+
+    :param topic: str Topic SEP payload was received from
+    :param payload_str: str SEP payload message as a string
+    :return: 
+    """
+    payload = json.loads(payload_str)
+    timestamp = datetime.datetime.fromtimestamp(payload["gmtime"], tz=datetime.timezone.utc)
+    electricity_consumption = int(payload["elecMtr"]["0702"]["04"]["00"], 16)
+    electricity_daily_consumption = int(payload["elecMtr"]["0702"]["04"]["01"], 16)
+    electricity_weekly_consumption = int(payload["elecMtr"]["0702"]["04"]["30"], 16)
+    electricity_monthly_consumption = int(payload["elecMtr"]["0702"]["04"]["40"], 16)
+    electricity_multiplier = int(payload["elecMtr"]["0702"]["03"]["01"], 16)
+    electricity_divisor = int(payload["elecMtr"]["0702"]["03"]["02"], 16)
+    electricity_meter = int(payload["elecMtr"]["0702"]["00"]["00"], 16)
+    electricity_mpan = payload["elecMtr"]["0702"]["03"]["07"]
+    gas_daily_consumption = int(payload["gasMtr"]["0702"]["0C"]["01"], 16)
+    gas_weekly_consumption = int(payload["gasMtr"]["0702"]["0C"]["30"], 16)
+    gas_monthly_consumption = int(payload["gasMtr"]["0702"]["0C"]["40"], 16)
+    gas_multiplier = int(payload["gasMtr"]["0702"]["03"]["01"], 16)
+    gas_divisor = int(payload["gasMtr"]["0702"]["03"]["02"], 16)
+    gas_meter = int(payload["gasMtr"]["0702"]["00"]["00"], 16)
+    gas_mpan = payload["gasMtr"]["0702"]["03"]["07"]
+    device_gid = payload["gid"]
+
+    assert(int(payload["elecMtr"]["0702"]["03"]["00"], 16) == 0) # kWh
+    assert(int(payload["gasMtr"]["0702"]["03"]["01"], 16) == 1) # m3
+    assert(int(payload["gasMtr"]["0702"]["03"]["12"], 16) == 0) # kWh
+
+    data = {
+        'timestamp': timestamp,
+        'tags': {
+            'topic': topic,
+            'gid': device_gid,
+        },
+        'electricity': {
+            'tags': {
+                'mpan': electricity_mpan,
+            },
+            'metrics': {
+                'draw': electricity_consumption * electricity_multiplier / electricity_divisor,
+                'consumption_daily': electricity_daily_consumption * electricity_multiplier / electricity_divisor,
+                'consumption_weekly': electricity_weekly_consumption * electricity_multiplier / electricity_divisor,
+                'consumption_monthly': electricity_monthly_consumption * electricity_multiplier / electricity_divisor,
+                'meter_reading': electricity_meter * electricity_multiplier / electricity_divisor,
+            },
+        },
+        'gas': {
+            'tags': {
+                'mpan': gas_mpan,
+            },
+            'metrics': {
+                'consumption_daily': gas_daily_consumption * gas_multiplier / gas_divisor,
+                'consumption_weekly': gas_weekly_consumption * gas_multiplier / gas_divisor,
+                'consumption_monthly': gas_monthly_consumption * gas_multiplier / gas_divisor,
+                'meter_reading': gas_meter * gas_multiplier / gas_divisor,
+            },
+        },
+    }
+
+    return data
+
+
+def usage_to_datapoints(usage):
+    datapoints = []
+
+    for utility in ['electricity', 'gas']:
+        datapoints.append({
+            "measurement": utility,
+            "tags": {**usage['tags'], **usage[utility]['tags']},
+            "time": usage['timestamp'].isoformat(),
+            "fields": usage[utility]['metrics'],
+        })
+
+    return datapoints
diff --git a/requirements.txt b/requirements.txt
new file mode 100644
index 0000000..cef196a
--- /dev/null
+++ b/requirements.txt
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+confuse~=1.3.0
+paho-mqtt~=1.5.0