How can I send a text message to a browser ? Here is my application:
AsyncWebServer server(80);
bool SelfTest= false;
void setup() {
...
server.on("/selftest", HTTP_GET, [](AsyncWebServerRequest *request){
SelfTest= true; // self test will be performed in loop()
request->send(200, "text/plain", "Performing self test...");
});
...
}
int Error;
void loop() {
if (SelfTest) {
Error= ... ; // self test will take 10 seconds. Result is in Error
... ; // How can I send Error to the web browser ?
SelfTest= false;
}
...
}