WiFiUDP only emit a packet on flush if not ended #2618
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A flush() on a packet that's already been sent should be a no-op, not send a 0-byte UDP packet. Track when an outgoing packet is dirty and only endPacket()/transmit it when so. Fixes #2617
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A flush() on a packet that's already been sent should be a no-op, not send a 0-byte UDP packet. Track when an outgoing packet is dirty and only endPacket()/transmit it when so.
Fixes #2617