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While I don't really see any changes to the control_msgs package between groovy and hydro (see control_msgs/compare/groovy-devel...hydro-devel), it could well be that the MD5 of the individual messages has changed, due to changes to the code generation. That would explain the error you are seeing.

Try again with a Groovy - Groovy, or Hydro - Hydro combination and see if that resolves your error (I'm betting it will).

The publisher is Groovy whist the receiver is Hydro.

While I don't really see any changes to the control_msgs package between groovy and hydro (see control_msgs/compare/groovy-devel...hydro-devel), it could well be that the MD5 of the individual messages has changed, due to changes to the code generation. That would explain the error you are seeing.

Try again with a Groovy - Groovy, or Hydro - Hydro combination and see if that resolves your error (I'm betting it will).