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WiFiNINA : Client class
Reads data from the client. If no arguments are given, it will return the next character in the buffer.
client.read()
client.read(buffer, size);
buffer: buffer to hold incoming packets (char*)
len: maximum size of the buffer (int)
b: the next character in the buffer (char)
size: the size of the data
-1: if no data is available
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