loramac-node frame counter

[faridm23]

I need to run a test where I want to send uplink messages with the same frame counter. Where in the stack can I find this fcnt byte that gets incremented whenever there is an uplink message?

[MedadRufus]

There is a function to get frame counter LoRaMacCryptoGetFCntUp(...)

LoRaMac-node/src/mac/LoRaMacCrypto.c

Lines 843 to 853 in 3d940d3

	LoRaMacCryptoStatus_t LoRaMacCryptoGetFCntUp( uint32_t* currentUp )
	{
	if( currentUp == NULL )
	{
	return LORAMAC_CRYPTO_ERROR_NPE;
	}
	*currentUp = CryptoNvm->FCntList.FCntUp + 1;
	return LORAMAC_CRYPTO_SUCCESS;
	}

You could quite feasibly make function that sets FCntUp in a similar way.

[faridm23]

Thank you for your reply! yes I saw that. I tried to hard code the frame counter to a value of 1. But it seems like the frame counter kept incrementing as it should.

Here is what I did:

*currentUp = 1; // CryptoNvm->FCntList.FCntUp + 1;

[faridm23]

the answer is in this line for anyone who might have same question as I did: CryptoNvm->FCntList.FCntUp = "Fcntvalue";