And this will be done using 900 Mhz RS232 wireless serial radios. They top out at 9600 baud.
But the receiver cannot read it and stuff it back into 6 sets of integers.
Use the hardware spi or uart, plus interrupts: configure the modules to trigger an isr when the data register is empty (or the transmission is done). In the isr, load up the next byte, until all four bytes / string have been done.