Transmit buffer full - python-can

Question

I am executing a python and can code to make a data log but when I run it I get the error Transmit buffer full
This is the code
#!/usr/bin/python3
#
## obdii_logger.py
#
# This python3 program sends out OBDII request then logs the reply to the sd card.
# For use with PiCAN boards on the Raspberry Pi
# http://skpang.co.uk/catalog/pican2-canbus-board-for-raspberry-pi-2-p-1475.html
#
# Make sure Python-CAN is installed first http://skpang.co.uk/blog/archives/1220
#
# 24-08-16 SK Pang
#
import RPi.GPIO as GPIO
import can
import time
import os
import queue
from threading import Thread
led = 22
GPIO.setmode(GPIO.BCM)
GPIO.setwarnings(False)
GPIO.setup(led,GPIO.OUT)
GPIO.output(led,True)
# For a list of PIDs visit https://en.wikipedia.org/wiki/OBD-II_PIDs
ENGINE_COOLANT_TEMP = 0x05
ENGINE_RPM = 0x0C
VEHICLE_SPEED = 0x0D
MAF_SENSOR = 0x10
O2_VOLTAGE = 0x14
THROTTLE = 0x11
PID_REQUEST = 0x7DF
PID_REPLY = 0x7E8
outfile = open('log.txt','w')
print('\n\rCAN Rx test')
print('Bring up CAN0....')
# Bring up can0 interface at 500kbps
os.system("sudo /sbin/ip link set can0 up type can bitrate 500000")
time.sleep(0.1)
print('Ready')
try:
bus = can.interface.Bus(channel='can0', bustype='socketcan')
except OSError:
print('Cannot find PiCAN board.')
GPIO.output(led,False)
exit()
def can_rx_task(): # Receive thread
while True:
message = bus.recv()
if message.arbitration_id == PID_REPLY:
q.put(message) # Put message into queue
def can_tx_task(): # Transmit thread
while True:
GPIO.output(led,True)
# Sent a Engine coolant temperature request
msg = can.Message(arbitration_id=PID_REQUEST,data=[0x02,0x01,ENGINE_COOLANT_TEMP,0x00,0x00,0x00,0x00,0x00], is_extended_id=False)
bus.send(msg)
time.sleep(0.05)
# Sent a Engine RPM request
msg = can.Message(arbitration_id=PID_REQUEST,data=[0x02,0x01,ENGINE_RPM,0x00,0x00,0x00,0x00,0x00], is_extended_id=False)
bus.send(msg)
time.sleep(0.05)
# Sent a Vehicle speed request
msg = can.Message(arbitration_id=PID_REQUEST,data=[0x02,0x01,VEHICLE_SPEED,0x00,0x00,0x00,0x00,0x00],is_extended_id=False)
bus.send(msg)
time.sleep(0.05)
# Sent a Throttle position request
msg = can.Message(arbitration_id=PID_REQUEST,data=[0x02,0x01,THROTTLE,0x00,0x00,0x00,0x00,0x00],is_extended_id=False)
bus.send(msg)
time.sleep(0.05)
GPIO.output(led,False)
time.sleep(0.1)
q = queue.Queue()
rx = Thread(target = can_rx_task)
rx.start()
tx = Thread(target = can_tx_task)
tx.start()
temperature = 0
rpm = 0
speed = 0
throttle = 0
c = ''
count = 0
# Main loop
try:
while True:
for i in range(4):
while(q.empty() == True): # Wait until there is a message
pass
message = q.get()
c = '{0:f},{1:d},'.format(message.timestamp,count)
if message.arbitration_id == PID_REPLY and message.data[2] == ENGINE_COOLANT_TEMP:
temperature = message.data[3] - 40 #Convert data into temperature in degree C
if message.arbitration_id == PID_REPLY and message.data[2] == ENGINE_RPM:
rpm = round(((message.data[3]*256) + message.data[4])/4) # Convert data to RPM
if message.arbitration_id == PID_REPLY and message.data[2] == VEHICLE_SPEED:
speed = message.data[3] # Convert data to km
if message.arbitration_id == PID_REPLY and message.data[2] == THROTTLE:
throttle = round((message.data[3]*100)/255) # Conver data to %
c += '{0:d},{1:d},{2:d},{3:d}'.format(temperature,rpm,speed,throttle)
print('\r {} '.format(c))
print(c,file = outfile) # Save data to file
count += 1
except KeyboardInterrupt:
#Catch keyboard interrupt
GPIO.output(led,False)
outfile.close() # Close logger file
os.system("sudo /sbin/ip link set can0 down")
print('\n\rKeyboard interrtupt')
I tried the command sudo ifconfig can0 txqueuelen 1000 but I still keep getting the same error Transmit buffer full