subscribe-options

Including the basic AMPS library:

#include <amps/ampsplusplus.hpp>

Constructing the command:

AMPS::Command cmd(AMPS::Message::Command::Subscribe);

AMPS::Message::Options opts;
opts.setTimestamp();

// Set other options as needed

cmd.setTopic(topic).setOptions(opts);

The command can now be used in execute or executeAsync.