You may use the network command NSLOOKUP to find your email server address. If you setup your email and use SMTP, it'll be the SMTP server name. We ran into an issue with the WiFi.h library not using the device MAC address, so some destinations will bounce you immediately as a spammer. ![]() Hello guys, ill getting fallowing error: Starting connection to server. [WiFiEsp] Connecting to 192.168.100.1 Connected to server [WiFiEsp] Data packet send error (2) [WiFiEsp] Failed to write to socket 0 [WiFiEsp] Disconnecting 0 heres the code: if (client.connect(server, 8082)) { Serial.println('Connected to server'); // Make a HTTP request //String content = 'Hey, just testing a post request.' ; client.println('POST /write_data HTTP/1.1'); client.println('Host: SERVER:PORT'); client.println('Accept: /'); client.println('Content-Length: ' + content.length()); client.println('Content-Type: application/x-www-form-urlencoded'); client.println(); client.println(content); content comes from ' root.printTo(content);' in my Json gen Could you help me? Spectraview 2 serial port. Thank you very much *edit i found replacing ' client.println('Content-Length: ' + String(content.length()));' solved the Problem. I have a server on my arduino (WiFi) and want to save the clients that connect, so that I can send to them (to each separately) data later. The question (and some of the answers) seem to misunderstand how HTTP works. I know how it works (at least to an extent) as I have written server scripts in Lua, as well as C++ for the Arduino. As I mention in when the client initiates a request it sends an HTTP header along these lines: POST /forum/showpost.php?id=12345&page=2 HTTP/1.1 User-Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:39.0) Host: www.example.com Cookie: foo=bar; Accept-Language: en, mi action=save&user_id=1234 Breaking those parts down you get this: Once the client has sent the request it awaits (on the same connection) for the server to respond. The response may look something like this: HTTP/1.1 200 OK Content-Type: text/html Connection: close Server: HTTPserver/1.0.0 (Arduino) Arduino test My heading Some text Notice the blank line between the HTTP header and the actual file data (the HTML data). Under HTTP 1.1 the server can request that the connection keep open the connection by replacing: Connection: close by: Connection: keep-alive All this means is that the client is still connected and can now request other stuff (for example an image from an tag). It does that by sending another HTTP header and then getting another response. It doesn't keep the connection open just so that the server can randomly send other stuff in the future. Note: - the default under HTTP 1.1 is for the connections to be persistent. So that I can send to them (to each separately) data later. You don't 'send data later', that's not how it works. The client may request data later. The standard way of keeping track of clients which are doing stuff (like filling in a series of forms) is to use cookies - that is what they are for. The server sends a cookie, the client remembers it, and sends it back with the next request. The cookie identifiers that it is the same client as before, and what it was doing. For example, a cookie might contain a token to indicate that you have logged in.
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