class RcvThread(threading.Thread):
"""A tread class that receives readings over the network"""
def __init__(self, cli_sock, node_name):
threading.Thread.__init__(self)
self.cli_sock = cli_sock
self.node_name = node_name
self.db_hdlr = DatabaseHandler('measurements.db')
self.alive = True
def run(self):
# Keep the receive streaming socket open
fd = self.cli_sock.fileno()
while self.alive:
# Check if there is something to read on the socket
# or if the socket has thrown exceptions for 20s
rlist, wlist, xlist = select.select(
[fd], [], [fd], 5)
if xlist:
break
if rlist:
# Receive data on the socket
data = self.cli_sock.recv(7).strip()
tag_id = data[:4]
rss = data[4:]
self.db_hdlr.ins_reading(self.node_name, tag_id, rss)
#print data, len(data), self.node_name
# Close this client socket
self.cli_sock.close()
self.db_hdlr.close_db();
def stop(self):
self.alive = False
def get_node_name(self):
return self.node_name
class Main: """A class for establishing connections""" def start_db_hdlr(self, db): self.db_hdlr = DatabaseHandler(db) self.db_hdlr.flush_rss_readings() self.db_hdlr.check_pos_tbl() self.db_hdlr.check_rsl_tbl() def start_net_srv(self): self.net_srv = NetworkServer() self.net_srv.start() def start_serial_conn(self, port, timeout): self.serial_conn = SerialConnection(port, timeout) self.serial_conn.open() self.serial_conn.flush_input() def start_trilat(self): self.trilat = Trilateration() self.trilat.start() def run(self): try: while True: data = self.serial_conn.read().strip() tag_id = data[:4] rss = data[4:] self.db_hdlr.ins_reading(2, tag_id, rss) except KeyboardInterrupt: self.db_hdlr.close_db() self.net_srv.stop() self.net_srv.join(60) self.trilat.stop() self.trilat.join(20) self.serial_conn.close()
