RAK7431 Remote Control and Configuration

Hi Im using a 7431 with a Rak gateway (2245).
i can correctly receive polled data from device, bu no way i can send a message to the device for configuration or transparent data reading.
i have followed carefully the quick setup procedures and also the AT commands manuals.
i send the Tx message and i receive an ack message with ack=false,

i sent this message via mqtt explorer:

application/4/device/0000000000000433/tx
{
“confirmed”:true,
“fPort”:1,
“data”:“030001000901010300000002C40B”
}
On the serial console i see this message:
it seem

SYSLOG:4:LoRa Rx : D37D34D35D34D3DD35D35D37D34D34D34D360B8D01
SYSLOG:4:LoRa Tx :

it seems that the message is received somehow corrupted?

where could be the problem?

other messages from scheduled on the device seems to communicate correctly

SYSLOG:4:DTU Tx : 010300000002C40B
SYSLOG:4:DTU Rx : 010304001C071AB80E
SYSLOG:4:LoRa Tx : 81000B000A01010304001C071AB80E
SYSLOG:4:DTU Tx : 010300000002C40B
SYSLOG:4:DTU Rx : 010304001C071AB80E
SYSLOG:4:LoRa Tx : 81000C000A01010304001C071AB80E

Thanks

Does it make any difference if you use fport 129?