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WiFiNINA : UDP class
Get the number of bytes (characters) available for reading from the buffer. This is data that's already arrived.
This function can only be successfully called after WiFiUDP.parsePacket().
available() inherits from the Stream utility class.
WiFiUDP.available()
None
the number of bytes available in the current packet
0: if WiFiUDP.parsePacket() hasn't been called yet
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