Hi,
Which LLCE version are you using? Also, what are you referring to as "there was no waiting for CH3 responses"? We see that the code you are referring to is waiting for CH2 which is waiting for the response of CH3, as told under the code.
As for the connection, the following is told under the LLCE documentation, we find the following:

For which, we expect a connection between CH2 and CH3, hence we don't see a problem.
Are you seeing any problems with the current example?
Please, let us know.