Thank you for the sample code. I flashed it and have the results below. Everything seems garbled. I had to change the CE and CSN pins only.
Here is the TX side
SimpleTx Starting
Data Sent abcdefghijklmnopqrstuvwxyz Acknowledge received
Data Sent ABCDEFGHIJKLMNOPQRSTUVWXYZ Acknowledge received
Data Sent 012345678901234567890123456789 Acknowledge received
Data Sent abcdefghijklmnopqrstuvwxyz Acknowledge received
Data Sent ABCDEFGHIJKLMNOPQRSTUVWXYZ Acknowledge received
Data Sent 012345678901234567890123456789 Acknowledge received
Data Sent abcdefghijklmnopqrstuvwxyz Acknowledge received
Data Sent ABCDEFGHIJKLMNOPQRSTUVWXYZ Acknowledge received
Data Sent 012345678901234567890123456789 Acknowledge received
Data Sent abcdefghijklmnopqrstuvwxyz Acknowledge received
Data Sent ABCDEFGHIJKLMNOPQRSTUVWXYZ Acknowledge received
Data Sent 012345678901234567890123456789 Acknowledge received
Data Sent abcdefghijklmnopqrstuvwxyz Acknowledge received
Here is the RX side
Data received qssvwww|}~xy{{~|}
Data received accfggglmoonoooxy{{~_|}
Data received 89;;>???<=89;;>???<=89;;>???<=
Data received qssvwww|}~xy{{~|}
Data received accfggglmoonooOxy{{~_|}Data received 89;;>???<=89;;>???<=89;;>???<9
Data received qssvwww|}~xy{{~|}
Data received accfGgglmoOnoooxy{{~_|}
Data received 89;;>???<=89;;>???<=89;;>???<=
Data received qssvwww|}~xy{{~|}
Data received accfggglmoonoooxy{{~|}
Data received 89;;>???<=89;;>???<=89;;>???<9
Data received
Data received accfgggLmoonoooxy{{~|}
Data received 89;;>???<=89;;>???<=89;;>???<=
Data received qssvwww|}~xy{{~|}