2018-08-04 19:04:17 +02:00
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#!/usr/bin/python3
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# -*- coding: UTF8 -*-
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <https://www.gnu.org/licenses/>.
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"""
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Transmit data from UART (GPIO) to MQTT broker
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"""
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__version__ = "0.1"
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# Dictionnary of data types and units
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data_type = {'cput' : "AT",
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'temp': "AT",
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'time': "TIME",
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'hum': "RH",
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'press': "AP",
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'vbat': "VBAT",
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'lat': "COOR",
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'lon': "COOR",
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'alt': "ALTI",
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'pasl': "MSPL",
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'qual': "MISC",
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'age': "MISC"}
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data_unit = {'cput' : "degC",
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'temp': "degC",
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'time': "",
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'hum': "%",
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'press': "hPa",
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'vbat': "V",
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'lat': "deg",
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'lon': "deg",
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'alt': "m",
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'pasl': "hPa",
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'qual': "",
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'age': "s"}
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###########
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# Imports #
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###########
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import serial
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import json
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import pprint
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import paho.mqtt.publish as mqtt
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from cameteo_conf import *
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########
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# Main #
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########
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# Serial : UART settings
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uart_name = "/dev/ttyAMA0" # ttyAMA0 = UART on GPIO
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uart_baud_rate = 115200
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# MQTT settings
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mqtt_client_id = "uart"
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mqtt_topic = "feather0"
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with serial.Serial(uart_name, uart_baud_rate, timeout=2) as uart:
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print(uart.name)
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while True:
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line = uart.readline()
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if line != b'':
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# If the line is not empty, it's data and they should be formatted as
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# compact JSON as bytes. Lets decode and load everything !
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data = json.loads(line.decode('utf8'))
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reception_date = datetime.utcnow().strftime("%Y/%m/%d %H:%M:%S ")
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#print("{} :\n{}".format(reception_date, data))
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# Formatting data for sending to MQTT broker (one source at a time)
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for s in data.items():
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for d in s[1].items():
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payload = json.dumps({"date": reception_date,
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"value": d[1],
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"unit": data_unit[d[0]],
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"type": data_type[d[0]]})
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2018-08-04 19:21:08 +02:00
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print(payload)
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mqtt.single("{}/{}".format(mqtt_topic, s[0]),
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payload= payload ,
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qos= 2 ,
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retain= True ,
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hostname= mqtt_host ,
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port= mqtt_port ,
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client_id= mqtt_client_id ,
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auth= mqtt_auth )
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