socket python functions
#!/usr/bin/env python3
import socket
HOST = '127.0.0.1' # The server's hostname or IP address
PORT = 65432 # The port used by the server
with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
s.connect((HOST, PORT))
s.sendall(b'Hello, world')
data = s.recv(1024)
print('Received', repr(data))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')socket python functions
s.listen()
conn, addr = s.accept()Copyright © 2021 Codeinu
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