Added concentrator script

tests/concentrator/README.md

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+# Concentrator
+
+Future software for Central Unit (RPi HAT / standalone embedded Linux computer). Temporary stored here, to be moved to Central Unit repository in the future.
+
+This script should read all sensors, log output (optionally send it to MQTT broker) and visualize current IAQ status (possibly show history graph) in webserver.
+
+For now only Flask is used to serve http content. This is not good solution for production environment; use nginx + uWSGI in the future.

tests/concentrator/concentrator.py

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+#!/usr/bin/env python3
+from sensor import Sensor
+from sys import argv,exit
+from flask import Flask
+from time import sleep
+import threading
+
+app = Flask('Sensor central unit')
+# list of sensor addresses
+address_list = [ 247 ]
+baudrate = 19200
+sensors = []
+modbus_mutex = threading.Lock()
+
+# Flask functions
+@app.route('/')
+def index():
+    html = ''
+    for s in sensors:
+        html += f'<h2>Address {s.address}</h2><br><h3>Input registers:</h3><br>'
+        for reg_name in s.input_registers:
+            reg_number = s.input_registers[reg_name]
+            with modbus_mutex:
+                reg_value = s.read_register(reg_number)
+            html += f'{reg_number : <10}&nbsp&nbsp{int(reg_value) : >10}&nbsp&nbsp{reg_name}<br>'
+        html += '<h3>Holding registers</h3><br>'
+        for reg_name in s.holding_registers:
+            reg_number = s.holding_registers[reg_name]
+            with modbus_mutex:
+                reg_value = s.read_register(reg_number)
+            html += f'{reg_number : <10}&nbsp&nbsp{int(reg_value) : >10}&nbsp&nbsp{reg_name}<br>'
+    return html
+
+for addr in address_list:
+    sensors.append(Sensor(addr, baudrate))
+
+# run webserver thread
+flask_thread = threading.Thread(target=app.run, kwargs={'host': '0.0.0.0', 'port': 8080})
+flask_thread.start()
+#app.run(host='0.0.0.0', port=8080)
+
+# measuring
+while True:
+    # logging: for now just writing to csv file (can be anything: write to db, mqtt...)
+    for s in sensors:
+        log_string = ''
+        for reg_name, reg_number in s.input_registers.items():
+            with modbus_mutex:
+                log_string += str(int(s.read_register(reg_number))) + ' '
+        log_string += str(s.readout_total) + ' '
+        log_string += str(s.readout_error_no_response) + ' '
+        log_string += str(s.readout_error_invalid_response) + ' '
+        with open(f'sensor_{s.address}.csv', 'a+') as f:
+            f.write(log_string + '\n')
+    sleep(10)
+

tests/concentrator/sensor.py

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+../sensor.py