Server.send Serial Monitor Input

Using Arduino Networking, Protocols, and Devices
1

Hi,
I have a Wemos D1 board (Esp8266 based)
I am trying to send some text to a server through Server.send
This is what I tried so far.

#include <ESP8266WiFi.h>
#include <WiFiClient.h>
#include <ESP8266WebServer.h>
#include <ESP8266mDNS.h>

const char* ssid = "MySpectrumWiFid8-2G";
const char* password = ".............";
ESP8266WebServer server(80);

const int led = 13;

void handleRoot() {
digitalWrite(led, 1);

server.send(200, "text/plain", Serial.read());
digitalWrite(led, 0);
}

void handleNotFound() {
digitalWrite(led, 1);
String message = "File Not Found\n\n";
message += "URI: ";
message += server.uri();
message += "\nMethod: ";
message += (server.method() == HTTP_GET) ? "GET" : "POST";
message += "\nArguments: ";
message += server.args();
message += "\n";
for (uint8_t i = 0; i < server.args(); i++) {
message += " " + server.argName(i) + ": " + server.arg(i) + "\n";
}
server.send(404, "text/plain", message);
digitalWrite(led, 0);
}

void setup(void) {
pinMode(led, OUTPUT);
digitalWrite(led, 0);
Serial.begin(115200);
WiFi.mode(WIFI_STA);
WiFi.begin(ssid, password);
Serial.println("");

// Wait for connection
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println("");
Serial.print("Connected to ");
Serial.println(ssid);
Serial.print("IP address: ");
Serial.println(WiFi.localIP());

if (MDNS.begin("esp8266")) {
Serial.println("MDNS responder started");
}

server.on("/", handleRoot);

server.on("/inline", {
server.send(200, "text/plain", "this works as well");
});

server.onNotFound(handleNotFound);

server.begin();
Serial.println("HTTP server started");
}

void loop(void) {
server.handleClient();
}

But I get this error:

HelloServer:17:47: error: converting to 'const String' from initializer list would use explicit constructor 'String::String(int, unsigned char)'

server.send(200, "text/plain", Serial.read());

^

void send(int code, const char* content_type = NULL, const String& content = String(""));

exit status 1
converting to 'const String' from initializer list would use explicit constructor 'String::String(int, unsigned char)'

I'm sorry if this is really informative, but I don't know what else I could add.

2

First: read the sticky post at the top of the forum! Always use code tags when posting code!

server.send(200, "text/plain", Serial.read());

What do you expect that line to do? Serial.read() returns an integer but the server.send() method doesn't expect an integer parameter.

If your intention is to send a string read from the serial interface, you must read the string from the serial, save it into a variable and let server.send() send that variable. This is because it's not very probable that a character is available at the serial interface just in the moment the HTTP request is handled. And you probably don't want to return just one single character.

3

Have a look at the examples in Serial Input Basics - simple reliable ways to receive data.

...R

4

What do you expect that line to do? Serial.read() returns an integer but the server.send() method doesn't expect an integer parameter.

If your intention is to send a string read from the serial interface, you must read the string from the serial, save it into a variable and let server.send() send that variable. This is because it's not very probable that a character is available at the serial interface just in the moment the HTTP request is handled. And you probably don't want to return just one single character.
[/quote]

Thank you for answering, but I'm not sure what this would look like.

I tried to get the Serial Input like this:
char SerialInput = Serial.read();

But then if I make this line of code:
server.send(200, "text/plain", SerialInput;

I get this error:
expected ')' before ';' token

5

zachgreen2018:
Thank you for answering, but I'm not sure what this would look like.

I tried to get the Serial Input like this:
char SerialInput = Serial.read();

Have you studied the link in Reply #2 ?

...R

6

Yes I tried to figure out how to apply Example 2 - Receiving several characters from the Serial Monitor
to my code, but I'm not completely sure how to go about this.
I experimented with it, but ultimately failed.

I probably misunderstood something. I really don't know.

7

zachgreen2018:
I experimented with it, but ultimately failed.

I probably misunderstood something. I really don't know.

Unless you post the program you tried I cannot see what you did or offer any advice to get things working.

...R

8

I'm just going to study the Serial Input Basics, like you suggested, until I get it.

I'll figure it out eventually.

Thank you.