Comments (8)
fscheu
commented on August 10, 2024
Are you sending the "Content-Length" parameter in your POST message with the length of the JSON?
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LeopoldoKnett
commented on August 10, 2024
Yes! This is the code:
...
char server[] = "api.sendgrid.com";
...
Serial.println("Starting connection to server...");
if (client.connect(server, 443)) {
Serial.println("Connected to server");
String data = "{\"personalizations\": [{\"to\": [{\"email\": \"*****.*****@gmail.com\"}]}],\"from\": {\"email\": \"*****@*****.com.br\"},\"subject\": \"Alerta de temperatura\",\"content\": [{\"type\": \"text/plain\", \"value\": \"Temperatura 30,1C\"}]}";
Serial.println(data);
Serial.println(String(data.length()));
client.println("POST /v3/mail/send HTTP/1.1");
client.println("Host: api.sendgrid.com:443");
client.println("Authorization: Bearer SG.******************************************************************");
client.println("Content-Type: application/json");
client.println("Connection: keep-alive");
client.println("Content-Length: " + String(data.length()));
client.println(data);
client.println();
}
There is no error at the Serial Monitor.
This is the debug output (Level 4):
21:58:09.167 -> SEND OK
21:58:09.167 -> > getClientState 3
21:58:09.199 -> ----------------------------------------------
21:58:09.262 -> >> AT+CIPSTATUS21:58:09.262 ->
21:58:09.262 -> +IPD,3,452,3.64.200.27,443:HTTP/1.1 400 Bad Request
21:58:09.326 -> Server: nginx
21:58:09.358 -> Date: Sat, 30 Jul 2022 20:58:09 GMT
21:58:09.390 -> Content-Type: text/html
21:58:09.423 -> Content-Length: 248
21:58:09.423 -> Connection: close
21:58:09.456 -> Strict-Transport-Security: max-age=600; includeSubDomains
21:58:09.519 ->
21:58:09.519 -> <html>
21:58:09.519 -> <head><title>400 The plain HTTP request was sent to HTTPS port</title></head>
21:58:09.616 -> <body>
21:58:09.616 -> <center><h1>400 Bad Request</h1></center>
21:58:09.647 -> <center>The plain HTTP request was sent to HTTPS port</center>
21:58:09.713 -> <hr><center>nginx</center>
21:58:09.744 -> </body>
21:58:09.744 -> </html>
21:58:09.777 -> STATUS:3
21:58:09.777 -> +CIPSTATUS:3,"TCP","3.64.200.27",443,45897,0
I appreciate any help
Thanks
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fscheu
commented on August 10, 2024
I think the problem is that you are making a post to a 443 port. This port is used for HTTPS connections and you are doing a standard HTTP.
In order to use HTTPS, I believe you need to have a certificate installed on your device. It is something that I never did so I can't help you with that.
You said that for a shorter message it works ¿Are you sure that the only difference is the length of the message?
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LeopoldoKnett
commented on August 10, 2024
The situation is now a little different after I figured out how to see the full log at level 4.
I've noticed that it doesn't work even with short messages either.
I'll change the title of this issue to "WiFiEsp: Send Post message from Arduino Mega + ESP-01 issue."
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JAndrassy
commented on August 10, 2024
add an empty line between headers and the data. it is required by the http protocol. your error is "bad request" as you can see.
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LeopoldoKnett
commented on August 10, 2024
I made some changes:
- Tip from fscheu: client.connectSSL(server, 443);
- Tip from JAndrassy's suggestion: Added an empty line between header and data.
Now the code is:
char server[] = "api.sendgrid.com";
...
if (client.connectSSL(server, 443)) {
Serial.println("Connected to server");
String data = "{\"personalizations\": [{\"to\": [{\"email\": \"********.*****@gmail.com\"}]}],\"from\": {\"email\": \"*******@*****.com.br\"},\"subject\": \"Alerta de temperatura\",\"content\": [{\"type\": \"text/plain\", \"value\": \"Temperatura 30,1C\"}]}";
Serial.println(data);
Serial.println(String(data.length()));
client.println("POST /v3/mail/send HTTP/1.1");
client.println("Host: api.sendgrid.com:443");
client.println("Authorization: Bearer SG.******************************************************************");
client.println("Content-Type: application/json");
client.println("Connection: keep-alive");
client.println("Content-Length: " + String(data.length()));
client.println();
client.println(data);
}
...
And this is the Debug output:
10:22:48.221 -> Starting connection to server...
10:22:48.254 -> [WiFiEsp] Connecting to api.sendgrid.com
10:22:48.286 -> > startClient api.sendgrid.com 443
10:22:48.351 -> ----------------------------------------------
10:22:48.383 -> >> AT+CIPSSLSIZE=4096
10:22:48.416 ->
10:22:48.416 -> OK
10:22:48.416 -> ---------------------------------------------- > 0
10:22:48.480 ->
10:22:48.480 -> ----------------------------------------------
10:22:48.513 -> >> AT+CIPSTART=3,"SSL","api.sendgrid.com",443
10:22:48.842 ->
10:22:48.842 -> ERROR
10:22:48.842 -> ---------------------------------------------- > 1
10:22:48.874 ->
10:22:48.906 -> > getClientState 3
10:22:48.906 -> ,CLOSED
10:22:48.906 ->
10:22:48.939 -> Dirty characters in the serial buffer! > 10
10:22:48.972 -> ----------------------------------------------
10:22:49.004 -> >> AT+CIPSTATUS
10:22:49.035 -> STATUS:4
10:22:49.035 ->
10:22:49.035 -> OK
10:22:49.068 -> No start tag found: 0
10:22:49.068 -> ---------------------------------------------- >
10:22:49.132 ->
10:22:49.132 -> Not connected
10:22:49.165 ->
10:22:49.165 -> Disconnecting from server...
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JAndrassy
commented on August 10, 2024
it is not able to connect. the site uses TLS 1.2. the AT firmware doesn't support TLS 1.2.
there is a 'fake' AT firmware which supports TLS 1.2
https://github.com/JiriBilek/ESP_ATMod
and it is better with my WiFiEspAT library
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LeopoldoKnett
commented on August 10, 2024
I just found an article on how to update the ESP-01 firmware...
I'll need to buy an adapter for this...
As soon as I have the adapter and have done the update I will come back here.
Thanks
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