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TheThingsNetworkGateway/lora_single_chan_gateway/gateway.py

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2018-11-15 18:21:45 +00:00
#!/usr/bin/env python3
import base64
import json
import logging
from random import randint
import socket
import sqlite3
from board_config import LoraBoardDraguino
import RPi.GPIO as GPIO
logging.basicConfig(level=logging.DEBUG)
GATEWAY_HOST = "router.eu.thethings.network"
GATEWAY_PORT = 1700
class LoRaPacketsDB(object):
def __init__(self):
self.conn = sqlite3.connect('gateway_packages.db') # we only need the db at runtime
self.c = self.conn.cursor()
self._init_db()
def _init_db(self):
create_table = """CREATE TABLE IF NOT EXISTS `PACKETS` (
`ID` INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
`DATETIME` TEXT NOT NULL,
`DATA` BLOB,
`FREQUENCY` NUMERIC,
`IS_CRC_OK` INTEGER,
`PKT_SNR` NUMERIC,
`PKT_RSSI` NUMERIC,
`RSSI` NUMERIC
)"""
self.conn.execute(create_table)
def log_pkg(self, board, packet):
query = """INSERT INTO `PACKETS` (
`DATETIME`,
`DATA`,
`FREQUENCY`,
`IS_CRC_OK`,
`PKT_SNR`,
`PKT_RSSI`,
`RSSI`
) VALUES (?, ?, ?, ?, ?, ?, ?)
"""
try:
self.c.execute(query, (payload['datetime'].isoformat(),
payload.get('payload'),
board.frequency,
payload.get('crc'),
payload.get('pkt_snr'),
payload.get('pkt_rssi'),
payload.get('rssi')))
self.conn.commit()
except sqlite3.IntegrityError as e:
logging.exception("SQL ERROR: ", e)
def construct_semtec_udp(board, payload):
# https://github.com/Lora-net/packet_forwarder/blob/d0226eae6e7b6bbaec6117d0d2372bf17819c438/PROTOCOL.TXT#L99
frame = bytearray()
frame.append(2) # Protocol version = 2
frame.extend([randint(0, 255), randint(0, 255)]) # Random numbers
frame.extend([0x80, 0xFA, 0x5C, 0xFF, 0xFF, 0x69, 0x33, 0xBB]) # TODO: construct from hardware
data = {
"rxpk":
{
"time": payload['datetime'].isoformat(),
"freq": board.frequency / 1000 / 1000,
"stat": 1 if payload['crc'] is True else -1,
"modu": "LORA",
"datr": "SF7BW125", # TODO: configurable
"codr": "4/5",
"rssi": payload['pkt_rssi'],
"lsnr": payload['pkt_snr'],
"size": len(payload['payload']),
"data": base64.standard_b64encode(payload['payload']).decode("utf-8")
}
}
frame.extend(map(ord, json.dumps(data)))
return bytes(frame)
if __name__ == "__main__":
# sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) # UDP
db = LoRaPacketsDB()
with LoraBoardDraguino(433300000, 7) as board:
board.set_mode_rx()
logging.info("Listening at SF{} on {} MHz".format(board.sf, board.frequency/1000000))
while True:
if GPIO.input(board._pin_dio0) == 1:
payload = board.receive_package()
# semtec_udp = construct_semtec_udp(board, payload)
# sock.sendto(semtec_udp, (GATEWAY_HOST, GATEWAY_PORT))
# logging.info(semtec_udp)
# logging.info("Received: {}".format(payload))
logging.info("Received at {}: {} = {}".format(payload['datetime'].isoformat(), payload['payload'].hex(), payload['payload'][4:]))
db.log_pkg(board, payload)