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d7abafea2f
This removes definitions relating to the built-in SNTP client that are LwIP v1 specific. Instead of duplicating these pull in the LwIP header that correspond to the required functions depending on the version of the stack being used. Without this fix calls to sntp_getserver() work but return invalid data and can lead to stack exhaustion. Update the NTP-TZ-DST example to use the Arduino sntp.h header rather than duplicate the conditional checks to use the LwIP header. Tests: - Build against a simple SNTP API demonstratin app and all LwIP configurations. Verify that the app runs for an extended period and that the expected results are obtained.