# CAN-bus read and filter
**URL:** https://mangoh.discourse.group/t/can-bus-read-and-filter/1262
**Category:** IoT Cards
**Created:** [March 21, 2018, 1:52pm UTC](https://mangoh.discourse.group/t/can-bus-read-and-filter/1262 "2018-03-21T13:52:49Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@raxsix](https://mangoh.discourse.group/u/raxsix)
#### Post date: [March 21, 2018, 1:52pm UTC](https://mangoh.discourse.group/t/can-bus-read-and-filter/1262/1 "2018-03-21T13:52:49Z")
I have CAN Bus IoT Module installed and connected to CAN traffic generator. If I enter to the target module (WP7502) over the ssh and type ifconfig then I can see that CAN is working
> can0 Link encap:UNSPEC HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00
> UP RUNNING NOARP MTU:16 Metric:1
> RX packets:6683 errors:0 dropped:0 overruns:0 frame:0
> TX packets:373 errors:0 dropped:0 overruns:0 carrier:0
> collisions:0 txqueuelen:10
> RX bytes:53464 (52.2 KiB) TX bytes:2984 (2.9 KiB)
I need to filter out messages and send them to MQTT server
What is the simplest way to read and filter CAN messages?
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### Author:  [@Francis.duhaut](https://mangoh.discourse.group/u/Francis.duhaut)
#### Post date: [March 21, 2018, 4:52pm UTC](https://mangoh.discourse.group/t/can-bus-read-and-filter/1262/2 "2018-03-21T16:52:57Z")
Hello,
I use SocketCAN with Linux to manage CANBUS connection with the IoT CARD.
You can find source code on Google.
Socket CAN include filtering messaging.
It’s easy to implement.
Francis.
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### Author:  [@Francis.duhaut](https://mangoh.discourse.group/u/Francis.duhaut)
#### Post date: [March 21, 2018, 9:16pm UTC](https://mangoh.discourse.group/t/can-bus-read-and-filter/1262/3 "2018-03-21T21:16:34Z")
Look my reply on this topic :
> [@CAN IoT Card driver](https://mangoh.discourse.group/t/can-iot-card-driver/997/30):
>
> Finally, saw the can0 line with ifconfig command after all those steps: echo 2 \> /sys/class/gpio/export echo out \> /sys/class/gpio/gpio2/direction echo 1 \> /sys/class/gpio/gpio2/value // Enable level shifter on the CAN IoT card echo 13 \> /sys/class/gpio/export echo out \> /sys/class/gpio/gpio13/direction echo 1 \> /sys/class/gpio/gpio13/value modprobe can modprobe can-dev modprobe can-raw modprobe mcp251x ip link set can0 type can bitrate 125000 triple-sampling on ifconfig can0 up …