Hello c-air,
what 'Communication Type' do you use in your CAN Object configuration? Usually, I would use the 'Receive Periodic Using Remote' type. It periodically transmits a remote request and copies the response (a data frame) into the receive buffer.
However, the object stops the periodic transmission, if there is no response (no data frame). So you can't generate a constant stream of periodic remote frames, if no one responds to them.
B2k