Basically I need my esp8266 to send data to my server and do that until I get a certain http status code, but I don't know how it works to get the status code. (I don't understand if it does this automatically or should I request it from the server and use it in some conditional repetition structure in my script)
A positive code is the value returned by the HTTP server. They are part of the HTTP protocol so you can look them up to see what they mean.
200 = Success
404 = Not Found
5xx = Internal Server Error
Negative numbers are for errors that prevented a reply. They are probably listed somewhere in the client documentation.
it depends at what level you code. some libraries will get the code for you easily for GET or POST requests
be specific about the library you have in mind
--
for example in HttpClient you have the method responseStatusCode()
for ESP32 HTTPClient, GET, POST, PUT will return directly the code
so you would do something like
http.begin(client, serviceURI);
code = http.GET();
if (code == HTTP_CODE_OK) {
...
} else {
Serial.print("HTTP GET error : ");
Serial.print(code);
Serial.print(" => ");
Serial.println(http.errorToString(code));
}
The file ESP8266HTTPClient.h gives names to two lists of status codes:
/// HTTP client errors
#define HTTPC_ERROR_CONNECTION_FAILED (-1)
#define HTTPC_ERROR_SEND_HEADER_FAILED (-2)
#define HTTPC_ERROR_SEND_PAYLOAD_FAILED (-3)
#define HTTPC_ERROR_NOT_CONNECTED (-4)
#define HTTPC_ERROR_CONNECTION_LOST (-5)
#define HTTPC_ERROR_NO_STREAM (-6)
#define HTTPC_ERROR_NO_HTTP_SERVER (-7)
#define HTTPC_ERROR_TOO_LESS_RAM (-8)
#define HTTPC_ERROR_ENCODING (-9)
#define HTTPC_ERROR_STREAM_WRITE (-10)
#define HTTPC_ERROR_READ_TIMEOUT (-11)
and
/// HTTP codes see RFC7231
typedef enum {
HTTP_CODE_CONTINUE = 100,
HTTP_CODE_SWITCHING_PROTOCOLS = 101,
HTTP_CODE_PROCESSING = 102,
HTTP_CODE_OK = 200,
HTTP_CODE_CREATED = 201,
HTTP_CODE_ACCEPTED = 202,
HTTP_CODE_NON_AUTHORITATIVE_INFORMATION = 203,
HTTP_CODE_NO_CONTENT = 204,
HTTP_CODE_RESET_CONTENT = 205,
HTTP_CODE_PARTIAL_CONTENT = 206,
HTTP_CODE_MULTI_STATUS = 207,
HTTP_CODE_ALREADY_REPORTED = 208,
HTTP_CODE_IM_USED = 226,
HTTP_CODE_MULTIPLE_CHOICES = 300,
HTTP_CODE_MOVED_PERMANENTLY = 301,
HTTP_CODE_FOUND = 302,
HTTP_CODE_SEE_OTHER = 303,
HTTP_CODE_NOT_MODIFIED = 304,
HTTP_CODE_USE_PROXY = 305,
HTTP_CODE_TEMPORARY_REDIRECT = 307,
HTTP_CODE_PERMANENT_REDIRECT = 308,
HTTP_CODE_BAD_REQUEST = 400,
HTTP_CODE_UNAUTHORIZED = 401,
HTTP_CODE_PAYMENT_REQUIRED = 402,
HTTP_CODE_FORBIDDEN = 403,
HTTP_CODE_NOT_FOUND = 404,
HTTP_CODE_METHOD_NOT_ALLOWED = 405,
HTTP_CODE_NOT_ACCEPTABLE = 406,
HTTP_CODE_PROXY_AUTHENTICATION_REQUIRED = 407,
HTTP_CODE_REQUEST_TIMEOUT = 408,
HTTP_CODE_CONFLICT = 409,
HTTP_CODE_GONE = 410,
HTTP_CODE_LENGTH_REQUIRED = 411,
HTTP_CODE_PRECONDITION_FAILED = 412,
HTTP_CODE_PAYLOAD_TOO_LARGE = 413,
HTTP_CODE_URI_TOO_LONG = 414,
HTTP_CODE_UNSUPPORTED_MEDIA_TYPE = 415,
HTTP_CODE_RANGE_NOT_SATISFIABLE = 416,
HTTP_CODE_EXPECTATION_FAILED = 417,
HTTP_CODE_MISDIRECTED_REQUEST = 421,
HTTP_CODE_UNPROCESSABLE_ENTITY = 422,
HTTP_CODE_LOCKED = 423,
HTTP_CODE_FAILED_DEPENDENCY = 424,
HTTP_CODE_UPGRADE_REQUIRED = 426,
HTTP_CODE_PRECONDITION_REQUIRED = 428,
HTTP_CODE_TOO_MANY_REQUESTS = 429,
HTTP_CODE_REQUEST_HEADER_FIELDS_TOO_LARGE = 431,
HTTP_CODE_INTERNAL_SERVER_ERROR = 500,
HTTP_CODE_NOT_IMPLEMENTED = 501,
HTTP_CODE_BAD_GATEWAY = 502,
HTTP_CODE_SERVICE_UNAVAILABLE = 503,
HTTP_CODE_GATEWAY_TIMEOUT = 504,
HTTP_CODE_HTTP_VERSION_NOT_SUPPORTED = 505,
HTTP_CODE_VARIANT_ALSO_NEGOTIATES = 506,
HTTP_CODE_INSUFFICIENT_STORAGE = 507,
HTTP_CODE_LOOP_DETECTED = 508,
HTTP_CODE_NOT_EXTENDED = 510,
HTTP_CODE_NETWORK_AUTHENTICATION_REQUIRED = 511
} t_http_codes;
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