I use ble_pds example which comes with bl_mcu_sdk and I noticed that RSSI, when it is advertising, is really really small. It show -95dB in nRF connect and I barely can connect to the device, only if I lay down my phone on it.
I have reworked the PCB and moved R13 to R12 and I use an external antenna. But the result is the same, unfortunately. However, when I use ble_peripheral example from the same SDK, RSSI level is descent, I can connect to the device from some distance.
P.S. I also have bl706iot kit and RSSI level for ble_pds is okay with it. Is it HW or FW problem?