Libserial read port

I am using libserial library to interact with a modem using c++. The C++ code sends an AT command:

my_serial_stream << "AT+CSQ" << '\r' ;

The modem responds with a response, either ERROR or OK,

The c++ code to read the response:

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while( serial_port.rdbuf()->in_avail() > 0 )
{
   char next_byte;
   serial_port.get(next_byte);
   std::cerr << std::hex << (int)next_byte << " ";
}
std::cerr << std::endl;


i would like to handle the response such that if the response is OK, the modem sends another command and if the response is ERROR, the modem resends the first command.
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