When I send SERVER commands to device I get response but in my log file I am getting
WARN "SMPP session channel unexpectedly closed" Enquire link failed, executing reconnect: - Channel was closed after sending request, but before receiving response - SmppChannelException (... < EnquireLinkTask:43 < ...)
So that the device status shows offline.
Have you set in traccar config the receiving number ?
Have you set on your SMSC server the SMPP account for traccar in transceiver mode or only send ?
tranceiver mode = send+receive
Is your SMSC server routing correctly the return SMS to the correct SMPP account of traccar ?