subscribe-bookmark-resume

Importing the AMPS client library:

using AMPS.Client;
using AMPS.Client.Exceptions;

Constructing the command:

Command cmd = new Command(Message.Commands.Subscribe)
                  .setTopic(topic)

                  // Comma-delimited list of subscriptions to resume
                  // together 
                  .setSubId(subIdList)

                  // Set "resume" (and any options needed to match original subscription)

                 .setOptions(Message.Options.Resume)
              ;

The command can now be used in execute or executeAsync.