114 lines
3.6 KiB
Python
114 lines
3.6 KiB
Python
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#!/usr/bin/env python3
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import base64
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import json
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import logging
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from random import randint
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import socket
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import sqlite3
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from board_config import LoraBoardDraguino
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import RPi.GPIO as GPIO
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logging.basicConfig(level=logging.DEBUG)
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GATEWAY_HOST = "router.eu.thethings.network"
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GATEWAY_PORT = 1700
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class LoRaPacketsDB(object):
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def __init__(self):
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self.conn = sqlite3.connect('gateway_packages.db') # we only need the db at runtime
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self.c = self.conn.cursor()
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self._init_db()
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def _init_db(self):
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create_table = """CREATE TABLE IF NOT EXISTS `PACKETS` (
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`ID` INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
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`DATETIME` TEXT NOT NULL,
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`DATA` BLOB,
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`FREQUENCY` NUMERIC,
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`IS_CRC_OK` INTEGER,
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`PKT_SNR` NUMERIC,
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`PKT_RSSI` NUMERIC,
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`RSSI` NUMERIC
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)"""
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self.conn.execute(create_table)
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def log_pkg(self, board, packet):
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query = """INSERT INTO `PACKETS` (
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`DATETIME`,
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`DATA`,
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`FREQUENCY`,
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`IS_CRC_OK`,
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`PKT_SNR`,
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`PKT_RSSI`,
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`RSSI`
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) VALUES (?, ?, ?, ?, ?, ?, ?)
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"""
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try:
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self.c.execute(query, (payload['datetime'].isoformat(),
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payload.get('payload'),
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board.frequency,
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payload.get('crc'),
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payload.get('pkt_snr'),
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payload.get('pkt_rssi'),
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payload.get('rssi')))
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self.conn.commit()
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except sqlite3.IntegrityError as e:
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logging.exception("SQL ERROR: ", e)
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def construct_semtec_udp(board, payload):
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# https://github.com/Lora-net/packet_forwarder/blob/d0226eae6e7b6bbaec6117d0d2372bf17819c438/PROTOCOL.TXT#L99
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frame = bytearray()
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frame.append(2) # Protocol version = 2
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frame.extend([randint(0, 255), randint(0, 255)]) # Random numbers
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frame.extend([0x80, 0xFA, 0x5C, 0xFF, 0xFF, 0x69, 0x33, 0xBB]) # TODO: construct from hardware
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data = {
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"rxpk":
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{
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"time": payload['datetime'].isoformat(),
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"freq": board.frequency / 1000 / 1000,
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"stat": 1 if payload['crc'] is True else -1,
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"modu": "LORA",
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"datr": "SF7BW125", # TODO: configurable
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"codr": "4/5",
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"rssi": payload['pkt_rssi'],
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"lsnr": payload['pkt_snr'],
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"size": len(payload['payload']),
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"data": base64.standard_b64encode(payload['payload']).decode("utf-8")
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}
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}
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frame.extend(map(ord, json.dumps(data)))
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return bytes(frame)
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if __name__ == "__main__":
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# sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) # UDP
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db = LoRaPacketsDB()
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with LoraBoardDraguino(433300000, 7) as board:
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board.set_mode_rx()
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logging.info("Listening at SF{} on {} MHz".format(board.sf, board.frequency/1000000))
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while True:
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if GPIO.input(board._pin_dio0) == 1:
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payload = board.receive_package()
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# semtec_udp = construct_semtec_udp(board, payload)
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# sock.sendto(semtec_udp, (GATEWAY_HOST, GATEWAY_PORT))
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# logging.info(semtec_udp)
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# logging.info("Received: {}".format(payload))
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logging.info("Received at {}: {} = {}".format(payload['datetime'].isoformat(), payload['payload'].hex(), payload['payload'][4:]))
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db.log_pkg(board, payload)
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