Initial version

2020-09-06 00:10:50 +01:00
commit 2b5c99e0cd
7 changed files with 263 additions and 0 deletions
--- a/energy_usage/sep.py
+++ 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