SMPP socket doesn't use TCP_NODELAY
The SMPP socket uses sockets directly (without relying on libosmo-netif/stream) and fails to setsockopt(TCP_NODELAY). This is not critical (SMS is sloooow), but it does add unintended latency to all SMPP messages sent.
The quick fix is to add the setsockopt for every socket we accept(). The clean-up would be to use libosmo-netif/stream...
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