Allow calculating an average over time for all packages received in a given time span

[michalrus]

Hello!

This seems useful to me:

• after a warmup receive all packets that the device is sending anyways for a given time,
• and output their average at the very end,
• which can then be fed to some external service, say InfluxDB etc.

Esp. if we output it as JSON:

diff --git a/pmlog.py b/pmlog.py
index 489ad7f..59f987a 100755
--- a/pmlog.py
+++ b/pmlog.py
@@ -7,6 +7,7 @@ import struct
 import logging
 import argparse
 import operator
+import json
 from collections import namedtuple
 from threading import Event

@@ -175,7 +176,7 @@ def run_average(sensor, args):
         sensor.disable()
         if num_packets > 0:
             avg = Packet(*tuple(map(lambda x: x/num_packets, summed_packets)))
-            log.info(avg)
+            print(json.dumps(avg._asdict()))
         else: exit(1)

 def install_signal_handlers(sensor):

[michalrus]

Eh, but it uses 100% CPU. Python’s insane. https://www.google.com/search?q=python+serial+port+read+cpu+100

[michalrus]

N.b. this problem also happens in the original code, w/o my PR.

[michalrus]

If anyone needs a no-bullshit solution, feel free to use https://github.com/michalrus/pms5003.