I’m designing my own M.2 to USB 3.0 adapter to host an EM7565 LTE modem and I have several questions.
The unused PCIe related pins (TX, RX, clocks,…), should they be left float or tied to ground?
The EM7565 supports dual SIM, but does the firmware supports hotswap of the SIM card (SIM connector with SIM detect pin support) while the system is running? No risk of data corruption on the SIM card?
Has the card to be disabled over an AT command before ejecting?
How does dual SIM actually works on such a modem???
Can the second SIM card received and send SMS’s while the main/first SIM card is connected to the internet/4G network?