Arduino uno User Manual

In line 3, we read the next separated string, which contains the actual path.
If you were to pass the request GET http://192.168.2.42/SAMSUNG/32/E0E040BF HTTP/1.1
to handle_command , path would contain /SAMSUNG/32/E0E040BF now.
At this stage, we have a string consisting of three strings separated by a slash
character (/). It’s time to use strsep again, and if you understand what happens
in lines 6 to 9, then you can call yourself familiar with both C and the strsep
function. In the end, the array args contains all three path elements. We can
pass the protocol name directly to send_ir_data , but we have to turn the bit
length and the value of the code into int and long values before. For the conver-
sion, we use the atoi and strtoul functions. We use the latter one to convert a
hexadecimal value to a decimal value.
Now we have defined all helper methods we need, and we only have to
implement the only public method of the InfraredProxy class:
RemoteControl/InfraredProxy/infrared_proxy.cpp
void InfraredProxy::receive_from_server(EthernetServer server) {
Line 1
const int MAX_LINE = 256;
-
char line[MAX_LINE];
-
EthernetClient client = server.available();
-
if (client) {
5
while (client.connected()) {
-
if (client.available()) {
-
read_line(client, line, MAX_LINE);
-
Serial.println(line);
-
if (line[0] == 'G' && line[1] == 'E' && line[2] == 'T')
10
handle_command(line);
-
if (!strcmp(line, "")) {
-
client.println("HTTP/1.1 200 OK\n");
-
break;
-
}
15
}
-
}
-
delay(1);
-
client.stop();
-
}
20
}
-
The receive_from_server method finally implements the core logic of our InfraredProxy
class. It expects an instance of the EthernetServer class that is defined in the
Ethernet library. It waits for a client to connect using EthernetServer ’s available
method in line 4. Whenever the server is connected to a client, it checks
whether the client has new data using EthernetClient ’s available method in line 7.
receive_from_server reads the data sent by the client line by line, calling read_line .
It prints each line to the serial port for debugging purposes, and for every line
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Arduino uno Specifications

General

Form factor	Arduino
Certification	RoHS, FC, CE
Processor model	-
Processor frequency	- MHz
Microcontroller model	ATmega328
Microcontroller frequency	16 MHz
DC input voltage	7-12 V
Operating voltage	5 V
DC current per I/O pin	40 mA
Flash memory	0.032 MB
Maximum internal memory	- GB
SRAM (Static Random Access Memory)	2 KB
EEPROM (Electrically Erasable Programmable Read-Only Memory)	1 KB
Wi-Fi	No
Number of analog I/O pins	6
Number of digital I/O pins	14

Weight and Dimensions

Board dimensions	53.4 x 68.6 mm