RAK3172 Parameter Error when sending more than 10 bytes

LPWAN Modules / EVBs RAK3172
1

I am testing the with a RAK3172 breakout board. I have noticed that if I send 10 bytes (2b33342011) using the AT+SEND= command everything works fine. However if I send 11 bytes (2b333420112) using the same command, I get a AT_PARAM_ERROR. I have set the DR = 2 and verified that ADR=0, and BAND=5.

What am I missing? It’s my understanding that for US band, and DR=2 the max payload size should be 125.

2

Hello @rbelk

When using AT+SEND, the payload is in hex written as ASCII characters. so the payload length must be always a even number.
2b33342011 = 5 bytes as hex 0x2b 0x33 0x34 0x20 0x11
2b333420112 = 5 1/2 bytes in hex ==> 0x2b 0x33 0x34 0x20 0x11 0x2? ==> ERROR

3

Ahh. I should have known that. I’ll give it a try here in a few minutes. Thanks for the response!