python socket
import socket
HOST = '127.0.0.1' # Standard loopback interface address (localhost)
PORT = 65432 # Port to listen on (non-privileged ports are > 1023)
with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
s.bind((HOST, PORT))
s.listen()
conn, addr = s.accept()
with conn:
print('Connected by', addr)
while True:
data = conn.recv(1024)
if not data:
break
conn.sendall(data)socket python functions
with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
pass # Use the socket object without calling s.close().python can socket
import socket
import struct
import sys
# CAN frame packing/unpacking (see `struct can_frame` in <linux/can.h>)
can_frame_fmt = "=IB3x8s"
def build_can_frame(can_id, data):
can_dlc = len(data)
data = data.ljust(8, b'x00')
return struct.pack(can_frame_fmt, can_id, can_dlc, data)
def dissect_can_frame(frame):
can_id, can_dlc, data = struct.unpack(can_frame_fmt, frame)
return (can_id, can_dlc, data[:can_dlc])
if len(sys.argv) != 2:
print('Provide CAN device name (can0, slcan0 etc.)')
sys.exit(0)
# create a raw socket and bind it to the given CAN interface
s = socket.socket(socket.AF_CAN, socket.SOCK_RAW, socket.CAN_RAW)
s.bind((sys.argv[1],))
while True:
cf, addr = s.recvfrom(16)
print('Received: can_id=%x, can_dlc=%x, data=%s' % dissect_can_frame(cf))
try:
s.send(cf)
except socket.error:
print('Error sending CAN frame')
try:
s.send(build_can_frame(0x01, b'x01x02x03'))
except socket.error:
print('Error sending CAN frame')Copyright © 2021 Codeinu
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