Soohwan Kim / Mbed 2 deprecated Simple_HTTPClient_JSON

Simple HTTP Client with JSON parser

Dependencies:   MbedJSONValue WIZnetInterface mbed

JSON is easy for machines to parse and generate which is based on a subset of the JavaScript Programming Language. Currently many Web Services allow to access data in JSON format. However, JSON parser is too big for low-end device as like a ARMmbed platform which has limited-resource. This example shows how to use HTTPClient parse Json data in ARMmbed platform.

main.cpp@0:e6cc33c4970b, 2015-10-29 (annotated)

Committer:
embeddist
Date:
Thu Oct 29 08:00:44 2015 +0000
Revision:
0:e6cc33c4970b
Initial Commit.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
embeddist 0:e6cc33c4970b 1 #include "mbed.h"
embeddist 0:e6cc33c4970b 2 #include "EthernetInterface.h"
embeddist 0:e6cc33c4970b 3 #include "MbedJSONValue.h"
embeddist 0:e6cc33c4970b 4
embeddist 0:e6cc33c4970b 5 MbedJSONValue parser;
embeddist 0:e6cc33c4970b 6 EthernetInterface eth;
embeddist 0:e6cc33c4970b 7 TCPSocketConnection sock;
embeddist 0:e6cc33c4970b 8
embeddist 0:e6cc33c4970b 9 int main()
embeddist 0:e6cc33c4970b 10 {
embeddist 0:e6cc33c4970b 11 int http_tx_msg_sz=800;
embeddist 0:e6cc33c4970b 12 char http_tx_msg[http_tx_msg_sz];
embeddist 0:e6cc33c4970b 13 int http_rx_msg_sz=500;
embeddist 0:e6cc33c4970b 14 char http_rx_msg[http_rx_msg_sz];
embeddist 0:e6cc33c4970b 15 int returnCode = 0;
embeddist 0:e6cc33c4970b 16
embeddist 0:e6cc33c4970b 17 // Enter a MAC address for your controller below.
embeddist 0:e6cc33c4970b 18 uint8_t mac_addr[6] = {0x00, 0x08, 0xDC, 0x00, 0x01, 0x02};
embeddist 0:e6cc33c4970b 19
embeddist 0:e6cc33c4970b 20 printf("initializing Ethernet\r\n");
embeddist 0:e6cc33c4970b 21 // initializing MAC address
embeddist 0:e6cc33c4970b 22 eth.init(mac_addr, "192.168.0.34", "255.255.255.0", "192.168.0.1");
embeddist 0:e6cc33c4970b 23
embeddist 0:e6cc33c4970b 24 // Check Ethenret Link
embeddist 0:e6cc33c4970b 25 if(eth.link() == true) printf("- Ethernet PHY Link-Done \r\n");
embeddist 0:e6cc33c4970b 26 else printf("- Ethernet PHY Link- Fail\r\n");
embeddist 0:e6cc33c4970b 27
embeddist 0:e6cc33c4970b 28 // Start Ethernet connecting: Trying to get an IP address using DHCP
embeddist 0:e6cc33c4970b 29 if (eth.connect()<0) printf("Fail - Ethernet Connecing");
embeddist 0:e6cc33c4970b 30
embeddist 0:e6cc33c4970b 31 // Print your local IP address:
embeddist 0:e6cc33c4970b 32 printf("IP=%s\n\r",eth.getIPAddress());
embeddist 0:e6cc33c4970b 33 printf("MASK=%s\n\r",eth.getNetworkMask());
embeddist 0:e6cc33c4970b 34 printf("GW=%s\n\r",eth.getGateway());
embeddist 0:e6cc33c4970b 35
embeddist 0:e6cc33c4970b 36 while(1) {
embeddist 0:e6cc33c4970b 37 sock.connect("192.168.0.223", 8000);
embeddist 0:e6cc33c4970b 38
embeddist 0:e6cc33c4970b 39 snprintf(http_tx_msg, http_tx_msg_sz, "GET / HTTP/1.1\r\nHost: 192.168.0.223:8000\r\nUser-Agent: WIZwiki-W7500ECO\r\nConection: close\r\n\r\n");
embeddist 0:e6cc33c4970b 40 sock.send_all(http_tx_msg, http_tx_msg_sz-1);
embeddist 0:e6cc33c4970b 41
embeddist 0:e6cc33c4970b 42 while ( (returnCode = sock.receive(http_rx_msg, http_rx_msg_sz-1)) > 0) {
embeddist 0:e6cc33c4970b 43 http_rx_msg[returnCode] = '\0';
embeddist 0:e6cc33c4970b 44 printf("Received %d chars from server:\n\r%s\n", returnCode, http_rx_msg);
embeddist 0:e6cc33c4970b 45 }
embeddist 0:e6cc33c4970b 46
embeddist 0:e6cc33c4970b 47 sock.close();
embeddist 0:e6cc33c4970b 48
embeddist 0:e6cc33c4970b 49 parse(parser, http_rx_msg);
embeddist 0:e6cc33c4970b 50 printf("name =%s\r\n" , parser["name"].get<string>().c_str());
embeddist 0:e6cc33c4970b 51 printf("age =%d\r\n" , parser["age"].get<int>());
embeddist 0:e6cc33c4970b 52 printf("gender =%s\r\n" , parser["gender"].get<string>().c_str());
embeddist 0:e6cc33c4970b 53
embeddist 0:e6cc33c4970b 54 wait(10);
embeddist 0:e6cc33c4970b 55 }
embeddist 0:e6cc33c4970b 56
embeddist 0:e6cc33c4970b 57 }