Both the NCS 3.0.2 NRF54L15 PCBA and DK development board occasionally fail to receive broadcast data. For comparison, running three PCBs simultaneously, the indicator light flashes when a broadcast is received. It can be observed that occasionally a few devices fail to receive the broadcast, while others do. These devices are placed next to the gateway, ruling out signal issues.
> HCI Event: LE Meta Event (0x3e) plen 11 #217 653.068500 Unknown (0x25) 00 00 7f d1 ff 9e 07 01 00 00 .......... > HCI Event: LE Meta Event (0x3e) plen 11 #218 654.160800 Unknown (0x25) 00 00 7f bf ff 9f 07 01 00 00 .......... > HCI Event: LE Meta Event (0x3e) plen 11 #219 655.253200 Unknown (0x25) 00 00 7f d1 ff a0 07 01 00 00 .......... > HCI Event: LE Meta Event (0x3e) plen 11 #220 656.345500 Unknown (0x25) 00 00 7f c7 ff a1 07 01 00 00 .......... > HCI Event: LE Meta Event (0x3e) plen 11 #221 657.437800 Unknown (0x25) 00 00 7f cb ff a2 07 01 00 00 .......... > HCI Event: LE Meta Event (0x3e) plen 11 #222 658.530200 Unknown (0x25) 00 00 7f d1 ff a3 07 01 00 00 .......... > HCI Event: LE Meta Event (0x3e) plen 11 #223 660.714900 Unknown (0x25) 00 00 7f bf ff a5 07 01 00 00 .......... > HCI Event: LE Meta Event (0x3e) plen 11 #224 661.807200 Unknown (0x25) 00 00 7f c7 ff a6 07 01 00 00 .......... > HCI Event: LE Meta Event (0x3e) plen 11 #225 662.899500 Unknown (0x25) 00 00 7f d2 ff a7 07 01 00 00 .......... > HCI Event: LE Meta Event (0x3e) plen 11 #226 663.991900 Unknown (0x25) 00 00 7f ce ff a8 07 01 00 00 .......... > HCI Event: LE Meta Event (0x3e) plen 11 #227 665.084200 Unknown (0x25) 00 00 7f d2 ff a9 07 01 00 00 .......... > HCI Event: LE Meta Event (0x3e) plen 11 #228 666.176600 Unknown (0x25) 00 00 7f ca ff aa 07 01 00 00 ..........
00 00 7f d1 ff a3 07 01 00 00 ..........
> HCI Event: LE Meta Event (0x3e) plen 11 #223 660.714900
Unknown (0x25)
00 00 7f bf ff a5 07 01 00 00 The broadcast was lost here.
The image shows the timing sequence captured by a logic analyzer when no broadcast was received, with the GPIO pulled high during gateway transmission and the GPIO pulled high again during tag reception. The timing sequence indicates that the tag has correctly opened the receive window. It can eliminate problems such as signal, interference, and reception timing. How to debug radio layer data reception?
The device correctly opened the receive window, and the gateway's transmission timing was also correct, yet the device did not receive data. My testing revealed that this situation occurs frequently, averaging once a minute with a broadcast cycle of approximately one second. Occasionally, data is lost intermittently, receiving one data point only to lose it again. CRC checksum errors occur approximately once every 10 minutes.