can I get the length of payload when using the funciton of nrf_gzll_fetch_packet_from_rx_fifo() in the gazell protocol on nrf51822

[Wayne Feng]

Hi,

there is an example named gzll_ack_payload in the SDK of nrf51822. when nrf51822 works in device mode, if a packet is send successfully, the funciton of nrf_gzll_device_tx_success() is called. my question: Can i get the length of payload while using nrf_gzll_fetch_packet_from_rx_fifo() if i don't know the length in advance?

thank you.

[Håkon Alseth]

Hi,

Yes, you can get the length. The input in the nrf_gzll_fetch_packet_from_rx_fifo() is a uint32_t * length, so gazell will modify the input variable and return you the length of the received packet:

uint8_t payload[NRF_GZLL_CONST_MAX_PAYLOAD_LENGTH];
uint32_t length = NRF_GZLL_CONST_MAX_PAYLOAD_LENGTH;
nrf_gzll_fetch_packet_from_rx_fifo(pipe, payload, &length);
/*
length will now hold the size of your received payload
*/

Best regards Håkon