Waveshare SIM8262E-M2 keep simcom-cm running after I log off

Following is hardware configuration

  1. Raspberry Pi 4 Model B
  2. Module: SIM8262E-M2
  3. Waveshare USB TO M.2 B KEY
    Using openwrt as per instruction given on waveshare website, following are steps
    Step1: Select System -> FileTransfer, select and upload simcom-cm in the simcom-cm directory of the folder
    Step2: Select System -> TTYD Terminal
    Step3: Enter the following commands in terminal
    cp /tmp/upload/simcom-cm /
    chmod a+x simcom-cm
    ./simcom-cm

Everything works fine but Closing this terminal will cause the networking program to stop.
Is there any other method which is independent of "TTYD Terminal".
Please suggest.

screen ? tmux ?

or try adding a & ?