5319bc7c2c
The W5100S Ethernet chip has only 4 hardware sockets. On RAK4631 Ethernet gateways with syslog and NTP enabled, all 4 sockets were permanently consumed (NTP UDP + Syslog UDP + TCP API listener + TCP API client), leaving none for MQTT, DHCP lease renewal, or additional TCP connections. - NTP: Remove permanent timeClient.begin() at startup; NTPClient::update() auto-initializes when needed. Add timeClient.end() after each query to release the UDP socket immediately. - Syslog: Remove socket allocation from Syslog::enable(). Open and close the UDP socket on-demand in _sendLog() around each message send. - MQTT: Fix socket leak in isValidConfig() where a successful test connection was never closed (PubSubClient destructor does not call disconnect). Add explicit pubSub->disconnect() before returning. Made-with: Cursor Co-authored-by: Ben Meadors <benmmeadors@gmail.com>