CC2340R5 can succeed as a central connection to ti's chip, but fails as a central connection to other devices such as onsemi or cell phone broadcasts.
I used project basic_ble of CC2340 newest SDK and project simple central of CC2642 to test conncet.
CC2340 to CC2340 or CC2642 succeed.
Related results as follows:
2340 to 2340:
CC2642 to onsemi RSL10 succeeded:
CC2340 to onsemi RSL10 failed.
CC2340 to cell phone(OPPO) broadcasts failed.
CC2340 to cell phone(Huawei mate 20) failed.
CC2642 to cell phone(Huawei mate 20) succeed.