我们正在尝试将基于Arduino的wifi蜂（ATmega 328P）连接到Cloudant数据库。 wifi蜜蜂使用wiwhield库连接到网络。我们可以使用它连接到cosm（xively）和post / get数据。但是，对于cloudant，我们无法这样做，并且不断获得503服务不可用的请求。
我认为问题在于Wishield期望指定IP地址，而Cloudant使用DNS ..我使用wishield添加代码片段，对于来自weather.com的GET数据工作正常，但是当我们修改cloudant.com的变量，只是给了我503请求。
请找到不同的代码： 代码片段：GetDatafromCloudant.ino：我们刚刚更改了云端GET请求的IP地址/端口详细信息。
/*
* A simple sketch that uses WiServer to get the hourly weather data from LAX and prints
* it via the Serial API
*/
#include <WiServer.h>
#define WIRELESS_MODE_INFRA 1
#define WIRELESS_MODE_ADHOC 2
// Wireless configuration parameters ----------------------------------------
unsigned char local_ip[] = {192,168,1,2}; // IP address of WiShield
unsigned char gateway_ip[] = {192,168,1,1}; // router or gateway IP address
unsigned char subnet_mask[] = {255,255,255,0}; // subnet mask for the local network
const prog_char ssid[] PROGMEM = {"BSNL_AP"}; // max 32 bytes
unsigned char security_type = 2; // 0 - open; 1 - WEP; 2 - WPA; 3 - WPA2
// WPA/WPA2 passphrase
const prog_char security_passphrase[] PROGMEM = {"bhutoriafamily"}; // max 64 characters
// WEP 128-bit keys
// sample HEX keys
prog_uchar wep_keys[] PROGMEM = { 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, // Key 0
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // Key 1
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // Key 2
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 // Key 3
};
// setup the wireless mode
// infrastructure - connect to AP
// adhoc - connect to another WiFi device
unsigned char wireless_mode = WIRELESS_MODE_INFRA;
unsigned char ssid_len;
unsigned char security_passphrase_len;
// End of wireless configuration parameters ----------------------------------------
// Function that prints data from the server
void printData(char* data, int len) {
// Print the data returned by the server
// Note that the data is not null-terminated, may be broken up into smaller packets, and
// includes the HTTP header.
while (len-- > 0) {
Serial.print(*(data++));
}
}
// IP Address for www.weather.gov
//uint8 ip[] = {140,90,113,200};
uint8 ip[] = {50,23,104,75};
// A request that gets the latest METAR weather data for LAX
GETrequest getWeather(ip, 5984, "http://alfatek.cloudant.com", "/wifi/_all_docs");
void setup() {
// Initialize WiServer (we'll pass NULL for the page serving function since we don't need to serve web pages)
WiServer.init(NULL);
// Enable Serial output and ask WiServer to generate log messages (optional)
Serial.begin(57600);
WiServer.enableVerboseMode(true);
// Have the processData function called when data is returned by the server
getWeather.setReturnFunc(printData);
}
// Time (in millis) when the data should be retrieved
long updateTime = 0;
void loop(){
// Check if it's time to get an update
if (millis() >= updateTime) {
getWeather.submit();
// Get another update one hour from now
updateTime += 1000 * 20 ;
}
// Run WiServer
WiServer.server_task();
delay(10);
}
代码片段：GetDatafromWeather.ino：这很好用，我们可以从weather.com提取LA天气数据的数据。
/*
* A simple sketch that uses WiServer to get the hourly weather data from LAX and prints
* it via the Serial API
*/
#include <WiServer.h>
#define WIRELESS_MODE_INFRA 1
#define WIRELESS_MODE_ADHOC 2
// Wireless configuration parameters ----------------------------------------
unsigned char local_ip[] = {192,168,1,2}; // IP address of WiShield
unsigned char gateway_ip[] = {192,168,1,1}; // router or gateway IP address
unsigned char subnet_mask[] = {255,255,255,0}; // subnet mask for the local network
const prog_char ssid[] PROGMEM = {"BSNL_AP"}; // max 32 bytes
unsigned char security_type = 2; // 0 - open; 1 - WEP; 2 - WPA; 3 - WPA2
// WPA/WPA2 passphrase
const prog_char security_passphrase[] PROGMEM = {"bhutoriafamily"}; // max 64 characters
// WEP 128-bit keys
// sample HEX keys
prog_uchar wep_keys[] PROGMEM = { 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, // Key 0
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // Key 1
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // Key 2
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 // Key 3
};
// setup the wireless mode
// infrastructure - connect to AP
// adhoc - connect to another WiFi device
unsigned char wireless_mode = WIRELESS_MODE_INFRA;
unsigned char ssid_len;
unsigned char security_passphrase_len;
// End of wireless configuration parameters ----------------------------------------
// Function that prints data from the server
void printData(char* data, int len) {
// Print the data returned by the server
// Note that the data is not null-terminated, may be broken up into smaller packets, and
// includes the HTTP header.
while (len-- > 0) {
Serial.print(*(data++));
}
}
// IP Address for www.weather.gov
uint8 ip[] = {140,90,113,200};
// A request that gets the latest METAR weather data for LAX
GETrequest getWeather(ip, 80, "www.weather.gov", "/data/METAR/KLAX.1.txt");
void setup() {
// Initialize WiServer (we'll pass NULL for the page serving function since we don't need to serve web pages)
WiServer.init(NULL);
// Enable Serial output and ask WiServer to generate log messages (optional)
Serial.begin(57600);
WiServer.enableVerboseMode(true);
// Have the processData function called when data is returned by the server
getWeather.setReturnFunc(printData);
}
// Time (in millis) when the data should be retrieved
long updateTime = 0;
void loop(){
// Check if it's time to get an update
if (millis() >= updateTime) {
getWeather.submit();
// Get another update one hour from now
updateTime += 1000 * 20 ;
}
// Run WiServer
WiServer.server_task();
delay(10);
}
答案 0 :(得分：3)
您是对的，Cloudant会根据提供的标头路由您的请求。您可以通过如下指定Host标头来处理此问题：Host: USERNAME.cloudant.com
您从Cloudant获取的503状态代码表示您登陆的负载均衡器不知道如何路由您的请求，因为它没有您的帐户名称。
您可以像这样连接IP（Bash终端）：host USERNAME.cloudant.com
然而，这不是一个好主意。
Cloudant使用DNS的原因是IP可以在服务的奇思妙想中改变。此外，故障转移到不同的负载平衡服务器和/或数据中心由DNS处理（数据中心内的本地故障转移由负载平衡器处理）。因此，您不会创建一个稳定的环境 - Cloudant可以，将更改您的IP，从而终止您的设置。
很抱歉，但听起来最好的解决方案是让DNS在您的环境中正常运行。
[来源：我在Cloudant工作。]