Soohwan Kim
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.
Diff: main.cpp
- Revision:
- 0:e6cc33c4970b
diff -r 000000000000 -r e6cc33c4970b main.cpp
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Thu Oct 29 08:00:44 2015 +0000
@@ -0,0 +1,57 @@
+#include "mbed.h"
+#include "EthernetInterface.h"
+#include "MbedJSONValue.h"
+
+MbedJSONValue parser;
+EthernetInterface eth;
+TCPSocketConnection sock;
+
+int main()
+{
+ int http_tx_msg_sz=800;
+ char http_tx_msg[http_tx_msg_sz];
+ int http_rx_msg_sz=500;
+ char http_rx_msg[http_rx_msg_sz];
+ int returnCode = 0;
+
+ // Enter a MAC address for your controller below.
+ uint8_t mac_addr[6] = {0x00, 0x08, 0xDC, 0x00, 0x01, 0x02};
+
+ printf("initializing Ethernet\r\n");
+ // initializing MAC address
+ eth.init(mac_addr, "192.168.0.34", "255.255.255.0", "192.168.0.1");
+
+ // Check Ethenret Link
+ if(eth.link() == true) printf("- Ethernet PHY Link-Done \r\n");
+ else printf("- Ethernet PHY Link- Fail\r\n");
+
+ // Start Ethernet connecting: Trying to get an IP address using DHCP
+ if (eth.connect()<0) printf("Fail - Ethernet Connecing");
+
+ // Print your local IP address:
+ printf("IP=%s\n\r",eth.getIPAddress());
+ printf("MASK=%s\n\r",eth.getNetworkMask());
+ printf("GW=%s\n\r",eth.getGateway());
+
+ while(1) {
+ sock.connect("192.168.0.223", 8000);
+
+ 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");
+ sock.send_all(http_tx_msg, http_tx_msg_sz-1);
+
+ while ( (returnCode = sock.receive(http_rx_msg, http_rx_msg_sz-1)) > 0) {
+ http_rx_msg[returnCode] = '\0';
+ printf("Received %d chars from server:\n\r%s\n", returnCode, http_rx_msg);
+ }
+
+ sock.close();
+
+ parse(parser, http_rx_msg);
+ printf("name =%s\r\n" , parser["name"].get<string>().c_str());
+ printf("age =%d\r\n" , parser["age"].get<int>());
+ printf("gender =%s\r\n" , parser["gender"].get<string>().c_str());
+
+ wait(10);
+ }
+
+}