S2LP - Trouble using both carrier sense and auto-acknowledgment

Hi all,

My application needs both features. Each one is working fine one at a time. But when I enable CS feature, I cannot receive the auto-acknowledgment anymore. I got the interrupt relative to data discarded, but I can confirm (using a RTL-SDR) both transmission and auto-acknowledgment are done. So the s2lp just cannot hear the auto-acknowledgment anymore. Here is the code:

/* CSMA configuration parameters */
#define PERSISTENT_MODE S_DISABLE
#define CCA_PERIOD CSMA_PERIOD_64TBIT
#define CCA_LENGTH		 1
#define MAX_BACKOFF_CYCLES 5
#define BU_COUNTER_SEED 0xFA21
#define BU_PRESCALER 0
 
#define RSSI_FLT						14
#define RSSI_MODE						RSSI_STATIC_MODE
#define RSSI_THR						-100
 
 
uint8_t Radio_Init() {
 
/* ... */
 
#ifdef CSMA_ENABLE
			/* Init Csma */
			SCsmaInit xCsmaInitValues = {
					.xCsmaPersistentMode = PERSISTENT_MODE,
					.xMultiplierTbit = CCA_PERIOD,
					.xCcaLength = CCA_LENGTH,
 .cMaxNb = MAX_BACKOFF_CYCLES,
 .nBuCounterSeed = BU_COUNTER_SEED,
 .cBuPrescaler = BU_PRESCALER,
			};
			S2LPCsmaInit(&xCsmaInitValues);
			S2LPCsma(S_ENABLE);
			SRssiInit xSRssiInit = {
			 .cRssiFlt = RSSI_FLT,
			 .xRssiMode = RSSI_MODE,
			 .cRssiThreshdBm = RSSI_THR,
			};
			S2LPRadioRssiInit(&xSRssiInit);
#endif
 
/* ... */
 
}

Does the chip supports both features at the same time? Do you have any clue on getting the CS working along with auto-ack?

Thanks,

Tristan