switching its frequency (hopping) when it decode the message(matches password)

[Madhuri Gummineni]

hi,
i am trying to write grc flow graph  to switch(hop) from one frequency to
other if it detects  the password.
if one usrp send a message as switch it should to other frequency.
for this what are blocks that are required.
planning like a remote operation to switch a sdr or usrp to switch or hop
based on password.
if one usrp send a message as password, then other usrp/sdr should hop if
password is correct otherwise it will not hop
 please help me sir