Arduino Uno Quick Start Manual page 196

delay(300);
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while (client.available()) {
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char c = client.read();
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Serial.print(c);
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}
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Serial.println("Disconnecting.");
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client.stop();
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}
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}
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void print_ip_address(IPAddress ip) {
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const unsigned int
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Serial.print("We've got the following IP address:
45
for (unsigned int
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Serial.print(ip[i]);
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if (i != OCTETS - 1)
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Serial.print(".");
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}
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Serial.println();
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}
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This program does the same as the program in the previous section, but it
doesn t contain any explicit IP addresses. Apart from that, it doesn t differ
much from the original version. The first difference is in line 8. Here we no
longer declare the variable
string contains the name of the server we re going to connect to.
In line 13, we no longer pass our own IP address to
this case, begin tries to obtain an unique IP address using a DHCP server in
the local network. If it cannot obtain an IP address, we start an endless loop
that prints an error message every second. Otherwise, we print the IP address
we ve got, using a small helper function named
Eventually, in line 27, we pass our
that we didn t change the line; we ve only changed the type of the
variable. If connect gets a string and not an
the IP address belonging to the server name stored in the string using DNS.
Run the program, and you ll see output similar to the following:
We've got the following IP address: 192.168.2.113
Connecting...connected.
56807 14-11-04 16:34:18 50 0 0 259.2 UTC(NIST) *
Disconnecting.
OCTETS = 4;
i = 0; i < OCTETS; i++) {
time_server as an IPAddress
time_server
IPAddress
www.it-ebooks.info
Using DHCP and DNS
");
object but as a string. The
Ethernet s begin method. In
print_ip_address .
string to the connect method. Note
object, it tries to look up
179
time_server
report erratum discuss