but it is a USB 4G stick, so there is nothing in
Anyway that i could see the signal of the 4G, please?
It's actually not "but". Various USB modems emulate various peripherals, let's call them "serial modem" and "ethernet interface", although there are actually sub-categories. And the mini-PCIe modem cards use USB for communication internally as well. So the difference is not "USB or internal" but "serial or ethernet". Some modems support both; in such case RouterOS chooses the Ethernet mode unless you tell it not to do so by setting
ignore-directip-modem to
yes as described
here.
If the connection as such works and the
/interface lte branch of the configuration is empty, it means that your USB stick emulates a serial modem, hence it appears under
/interface ppp-client. Can you confirm that?
If so, you need a manual for AT commands for your USB stick, and send these AT commands using the proper sub-channel - see the
/interface ppp-client at-chat command. Many AT commands are the same across vendors, but nothing is guaranteed.
You are interested in RSSI, RSRP, RSRQ, SINR parameters.