ROSSerial is intermittently sending Unable to sync with device error

[Pito Salas]

Our current config is: - Teensy 4.0 - Raspberry Pi 4b - ROS Noetic Ubuntu 20.04

It is practically the same config we use on our other robots. We are using the latest Linorobot stuff, definitely building with pio run --target upload -e teensy40. We are getting an avalanche of this error, and once we get it, it doesn't go away: "[ERROR [1682632635.173195]: Unable to sync with device; possible link problem or link software versi on mismatch such as hydro rossertal_python with groovy Arduino"

.

We can sometimes re-install ros-noetic-rosserial and the problem goes away but always reappears. We have tried:

1) Turning off and detaching all other USBs from the 

Pi 2) We've reinstalled ros-noetic-rosserial-python and rosnoetic-rosserial-arduino 

3) We have recreated the ros_lib directory for teensy

4) We have changed usb cables multiple times.

Any ideas would be appreciated. We have wasted so much time on this!

[Venkat Prasad]

Match the bitrate of the hardware in rosserial rum in argument 

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[jime...@gmail.com]

could be the messages have been deprecated already.. you can update it by

$ cd linorobot/teensy/firmware/lib

$ rosrun rosserial_client make_libraries .

Just delete the messages you don't need as it'll generate all messages available in your system.