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MT commands

I am testing the SYS_PING MT command with the ZNP firmware (CC1352) + a terminal,

I am using BR:115200, Parity: none; Bit Stop: 1

I am sending via terminal the bytes relative to SYS_PING: 0xFE 0x00 0x21 0x01 0x20

But I have not answer from the ZNP.

If I send the SYS_PING command with Z-tool it works.

Then I have a problem with my bytes string relative to SYS_PING.

Please, Does anyone have any idea what I'm doing wrong?

Thaknyou very much. Best Rgards