Refactor to remove sqlite3 & pass flake8

.gitignore

@@ -1,4 +1,5 @@
 *.db
+*.sqlite3
 # Created by https://www.gitignore.io/api/python,git
 # Edit at https://www.gitignore.io/?templates=python,git
 

lora_single_chan_gateway/gateway.py

@@ -5,7 +5,6 @@ import json
 import logging
 from random import randint
 import socket
-import sqlite3
 
 from board_config import LoraBoardDraguino
 import RPi.GPIO as GPIO
@@ -20,46 +19,19 @@ GATEWAY_PORT = 1700
 
 class LoRaPacketsDB(object):
     def __init__(self):
-        self.conn = sqlite3.connect('gateway_packages.db')  # we only need the db at runtime
+        pass
-        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` (
+        print("[{}] [receive] freq: {}, crc: {}, signal-noise-ratio: {}, signal strength: {} (packet: {})".format(
-            `DATETIME`,
+            payload['datetime'].isoformat(),
-            `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('rssi'),
             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):
@@ -67,7 +39,10 @@ def construct_semtec_udp(board, payload):
     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
+    frame.extend([
+        0x80, 0xFA, 0x5C, 0xFF,
+        0xFF, 0x69, 0x33, 0xBB
+    ])  # TODO: construct from hardware
 
     data = {
         "rxpk":
@@ -81,7 +56,8 @@ def construct_semtec_udp(board, payload):
                 "rssi": payload['pkt_rssi'],
                 "lsnr": payload['pkt_snr'],
                 "size": len(payload['payload']),
-                "data": base64.standard_b64encode(payload['payload']).decode("utf-8")
+                "data": base64.standard_b64encode(payload['payload'])
+                        .decode("utf-8")
             }
     }
 
@@ -97,7 +73,10 @@ if __name__ == "__main__":
 
     with LoraBoardDraguino(433300000, 7) as board:
         board.set_mode_rx()
-        logging.info("Listening at SF{} on {} MHz".format(board.sf, board.frequency/1000000))
+        print("Listening at SF{} on {} MHz".format(
+            board.sf,
+            board.frequency / 1000000
+        ))
 
         while True:
             if GPIO.input(board._pin_dio0) == 1:
@@ -108,6 +87,10 @@ if __name__ == "__main__":
                 # logging.info(semtec_udp)
 
                 # logging.info("Received: {}".format(payload))
-                logging.info("Received at {}: {} = {}".format(payload['datetime'].isoformat(), payload['payload'].hex(), payload['payload'][4:]))
+                print("Received at {}: {} = {}".format(
+                    payload['datetime'].isoformat(),
+                    payload['payload'].hex(),
+                    payload['payload'][4:]
+                ))
 
                 db.log_pkg(board, payload)