NodeMCU ESP32 : Protocol version of client is unrecognized, expected Rev 1 (rosserial 0.5+)

[sunnysetia93]

I have ROS melodic installed on my Master Linux machine where I have my roscore running.

I have serially connected NodeMCU esp32 to the linux machine, where esp32 publishes data of an ultrasonic sensor on a topic which is then subscribed by node running on a linux machine.

I get this error when I am trying to run
rosrun rosserial_python serial_node.py /dev/ttyUSB0
Error: Protocol version of client is unrecognized, expected Rev 1 (rosserial 0.5+)

that is why when i run rostopic echo /topicname, there is no such topic found.

Also, When I run the same code on arduino UNO, everything works as expected.

Kindly help me with a detailed explanation as I am a beginner in ROS and cannot proceed further.

[sujoy743175]

hi @sunnysetia93 ... you must have solved the problem ... can you help me to come out of the same ... m using neotic and foxy . thank you...

[DeepakKumarShah]

@sujoy743175

ros-drivers/rosserial#354 here some people seem to have solved this problem. If you understand their there discussion then please explain me too, I am not good at programming.

[DeepakKumarShah]

It solved my problem.

[joedavidbuilds]

My ESP-32 was running at 240Mhz, when I changed it to 160Mhz this error was gone. You change it in the Arduino IDE tools>CPU frequency

[AbrarMahmud]

It solved my problem.

It worked for me too.---Thanks---