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#!/usr/bin/env python

"""

This example exercises the periodic task's multiple message sending capabilities

Expects a vcan0 interface:

python3 -m examples.cyclic_multiple

"""

import logging

import time

import can

logging.basicConfig(level=logging.INFO)

def cyclic_multiple_send(bus):

"""

Sends periodic messages every 1 s with no explicit timeout

Sleeps for 10 seconds then stops the task.

"""

print("Starting to send a message every 1 s for 10 s")

messages = []

messages.append(

can.Message(

arbitration_id=0x401,

data=[0x11, 0x11, 0x11, 0x11, 0x11, 0x11],

is_extended_id=False,

)

)

messages.append(

can.Message(

arbitration_id=0x401,

data=[0x22, 0x22, 0x22, 0x22, 0x22, 0x22],

is_extended_id=False,

)

)

messages.append(

can.Message(

arbitration_id=0x401,

data=[0x33, 0x33, 0x33, 0x33, 0x33, 0x33],

is_extended_id=False,

)

)

messages.append(

can.Message(

arbitration_id=0x401,

data=[0x44, 0x44, 0x44, 0x44, 0x44, 0x44],

is_extended_id=False,

)

)

messages.append(

can.Message(

arbitration_id=0x401,

data=[0x55, 0x55, 0x55, 0x55, 0x55, 0x55],

is_extended_id=False,

)

)

task = bus.send_periodic(messages, 1)

assert isinstance(task, can.CyclicSendTaskABC)

time.sleep(10)

task.stop()

print("stopped cyclic send")

def cyclic_multiple_send_modify(bus):

"""

Sends initial set of 3 Messages containing Odd data sent every 1 s with

no explicit timeout. Sleeps for 8 s.

Then the set is updated to 3 Messages containing Even data.

Sleeps for 10 s.

"""

messages_odd = []

messages_odd.append(

can.Message(

arbitration_id=0x401,

data=[0x11, 0x11, 0x11, 0x11, 0x11, 0x11],

is_extended_id=False,

)

)

messages_odd.append(

can.Message(

arbitration_id=0x401,

data=[0x33, 0x33, 0x33, 0x33, 0x33, 0x33],

is_extended_id=False,

)

)

messages_odd.append(

can.Message(

arbitration_id=0x401,

data=[0x55, 0x55, 0x55, 0x55, 0x55, 0x55],

is_extended_id=False,

)

)

messages_even = []

messages_even.append(

can.Message(

arbitration_id=0x401,

data=[0x22, 0x22, 0x22, 0x22, 0x22, 0x22],

is_extended_id=False,

)

)

messages_even.append(

can.Message(

arbitration_id=0x401,

data=[0x44, 0x44, 0x44, 0x44, 0x44, 0x44],

is_extended_id=False,

)

)

messages_even.append(

can.Message(

arbitration_id=0x401,

data=[0x66, 0x66, 0x66, 0x66, 0x66, 0x66],

is_extended_id=False,

)

)

print("Starting to send a message with odd every 1 s for 8 s with odd data")

task = bus.send_periodic(messages_odd, 1)

assert isinstance(task, can.CyclicSendTaskABC)

time.sleep(8)

print("Starting to send a message with even data every 1 s for 10 s with even data")

task.modify_data(messages_even)

time.sleep(10)

print("stopped cyclic modify send")

if __name__ == "__main__":

for interface, channel in [("socketcan", "vcan0")]:

print(f"Carrying out cyclic multiple tests with {interface} interface")

with can.Bus(interface=interface, channel=channel, bitrate=500000) as BUS:

cyclic_multiple_send(BUS)

cyclic_multiple_send_modify(BUS)

time.sleep(2)