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

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