Perhaps you have used proto_smpp and have not encountered its shortcomings, but I think
that its discussion is not very appropriate on this platform. I will briefly inform you
that in this module there is no control over the results of sending commands neither for
submit_sm, nor for enquire_link. For example, the absence of a response to enquire_link is
not an error for him. It is also not possible to connect multiple SMEs with different
credentials to one smpp-server. It seems that this module is in the MVP state, maybe
I'm wrong.
Best regards,
Vadim Saranov