根据该示例，我应该得到“响应代码202”。但是，我收到“响应代码0”。因此，我在ThingSpeak频道上什么都没得到。我的开发板是ESP8266开发人员。
我的串行监视器显示以下输出：
Attempting to connect to SSID: Xperia Z_a769
Connected to wifi
SSID: Xperia Z_a769
IP Address: **********
signal strength (RSSI):-47 dBm
Response code:0
为什么我收到响应码0？我该如何解决此问题，以便在Thingspeak.com上获取数据。
我在下面附加了我的代码：
/* This example shows how to bulk update a ThingSpeak channel using an
Arduino MKR1000 or an ESP8266*/
#include <EthernetClient.h> //Uncomment this library to work with ESP8266
#include <ESP8266WiFi.h> //Uncomment this library to work with ESP8266
//#include<SPI.h> // Comment this to work with ESP8266 board
//#include<WiFi101.h> // Comment this to work with ESP8266 board
char jsonBuffer[500] = "["; // Initialize the jsonBuffer to hold data
char ssid[] = "Xperia Z_a769"; // Your network SSID (name)
char pass[] = "7c6761b56ed2"; // Your network password
WiFiClient client; // Initialize the WiFi client library
char server[] = "api.thingspeak.com"; // ThingSpeak Server
/* Collect data once every 15 seconds and post data to ThingSpeak channel
once every 2 minutes */
unsigned long lastConnectionTime = 0; // Track the last connection time
unsigned long lastUpdateTime = 0; // Track the last update time
const unsigned long postingInterval = 120L * 1000L; // Post data every 2 minutes
const unsigned long updateInterval = 15L * 1000L; // Update once every 15 seconds
void setup() {
Serial.begin(9600);
// Attempt to connect to WiFi network
while (WiFi.status() != WL_CONNECTED) {
Serial.print("Attempting to connect to SSID: ");
Serial.println(ssid);
WiFi.begin(ssid, pass); // Connect to WPA/WPA2 network. Change this
// line if using open or WEP network
delay(10000); // Wait 10 seconds to connect
}
Serial.println("Connected to wifi");
printWiFiStatus(); // Print WiFi connection information
}
void loop() {
// If update time has reached 15 seconds, then update the jsonBuffer
if (millis() - lastUpdateTime >= updateInterval) {
updatesJson(jsonBuffer);
}
}
// Updates the jsonBuffer with data
void updatesJson(char* jsonBuffer){
/* JSON format for updates paramter in the API
* This example uses the relative timestamp as it uses the
"delta_t". If your device has a real-time clock, you can provide the
absolute timestamp using the "created_at" parameter
* instead of "delta_t".
* "[{\"delta_t\":0,\"field1\":-70},{\"delta_t\":15,\"field1\":-66}]"
*/
// Format the jsonBuffer as noted above
strcat(jsonBuffer,"{\"delta_t\":");
unsigned long deltaT = (millis() - lastUpdateTime)/1000;
size_t lengthT = String(deltaT).length();
char temp[4];
String(deltaT).toCharArray(temp,lengthT+1);
strcat(jsonBuffer,temp);
strcat(jsonBuffer,",");
long rssi = WiFi.RSSI();
strcat(jsonBuffer, "\"field1\":");
lengthT = String(rssi).length();
String(rssi).toCharArray(temp,lengthT+1);
strcat(jsonBuffer,temp);
strcat(jsonBuffer,"},");
// If posting interval time has reached 2 minutes, then update the
// ThingSpeak channel with your data
if (millis() - lastConnectionTime >= postingInterval) {
size_t len = strlen(jsonBuffer);
jsonBuffer[len-1] = ']';
httpRequest(jsonBuffer);
}
lastUpdateTime = millis(); // Update the last update time
}
// Updates the ThingSpeakchannel with data
void httpRequest(char* jsonBuffer) {
/* JSON format for data buffer in the API
* This example uses the relative timestamp as it uses the "delta_t". If
your device has a real-time clock, you can also provide the absolute
timestamp using the "created_at" parameter
* instead of "delta_t".
* "{\"write_api_key\":\"YOUR-CHANNEL-WRITEAPIKEY\",\"updates\":
[{\"delta_t\":0,\"field1\":-60},{\"delta_t\":15,\"field1\":200},
{\"delta_t\":15,\"field1\":-66}]
*/
// Format the data buffer as noted above
char data[500] = "{\"write_api_key\":\"6OF022OLH2QM50TP\",\"updates\":";
//Replace YOUR-CHANNEL-WRITEAPIKEY with your ThingSpeak channel write API key
strcat(data,jsonBuffer);
strcat(data,"}");
// Close any connection before sending a new request
client.stop();
String data_length = String(strlen(data)+1); //Compute the data buffer length
// POST data to ThingSpeak
if (client.connect(server, 80)) {
client.println("POST /channels/522490/bulk_update.json HTTP/1.1");
//Replace YOUR-CHANNEL-ID with your ThingSpeak channel ID
client.println("Host: api.thingspeak.com");
client.println("User-Agent: mw.doc.bulk-update (Arduino ESP8266)");
client.println("Connection: close");
client.println("Content-Type: application/json");
client.println("Content-Length: "+data_length);
client.println();
client.println(data);
}
else {
Serial.println("Failure: Failed to connect to ThingSpeak");
}
delay(15000); //Wait to receive the response
client.parseFloat();
String resp = String(client.parseInt());
Serial.println("Response code:"+resp); // Print the response code. 202
// indicates that the server has accepted the response
jsonBuffer[0] = '['; // Reinitialize the jsonBuffer for next batch of data
jsonBuffer[1] = '\0';
lastConnectionTime = millis(); // Update the last connection time
}
void printWiFiStatus() {
// Print the SSID of the network you're attached to:
Serial.print("SSID: ");
Serial.println(WiFi.SSID());
// Print your device IP address:
IPAddress ip = WiFi.localIP();
Serial.print("IP Address: ");
Serial.println(ip);
// Print the received signal strength:
long rssi = WiFi.RSSI();
Serial.print("signal strength (RSSI):");
Serial.print(rssi);
Serial.println(" dBm");
}