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You could refactor the statements to move the $(eval ...) into the value property. We use this in melodic, so I know it is supported.

Also, your launch file code is just wrong if you intended to implement "if mode == 'sim' then IP1 else IP2.

You could refactor the statements to move the $(eval ...) into the value property. We use this in melodic, so I know it is supported.

Also, your launch file code is just wrong if you intended to implement "if implement:

if mode == 'sim' then IP1 else IP2.

IP2