Hello,
so I'm at a bit of a loss here. I'm trying to do a - rather simple - HTTP-Request to my ESP32. Most of them are working and my project so far has grown pretty big. However one of my HTTP_POST gives me a headache. I'm familiar with programming in general, but I'm not that good with C++. I broke my code down to a minimal example:
#include <WiFi.h>
#include <AsyncTCP.h>
#include <ESPAsyncWebServer.h>
#define ARDUINOJSON_USE_LONG_LONG 1
#include <ArduinoJson.h>
//Data
const char* ssid = "MySSID";
const char* password = "MySuperSafePassowrd";
struct Rule{
int lightID; //ID of the corresponding light
int ID; //starts with 1;
String name; //
unsigned long dateTime;
byte frequency; //1:Once, 2:Daily, 3:Weekly
byte deactivated; //1:NONE, 2:ONCE, 3:PERMANENT
byte action; //1:OFF, 2:ON, 3:SWITCH
};
//Variables
AsyncWebServer httpServer(80);
//Setup-Method
void setup() {
Serial.begin(115200);
Serial.println("Setup");
connectToWifi();
Serial.println("connected");
startHTTPServer();
Serial.println("Server started");
}
//Loop-Methode: Ticker
void loop() {
//check();
}
//Helpmethods
void connectToWifi() {
Serial.println();
Serial.print("Connecting to ");
WiFi.disconnect(true);
Serial.println(ssid);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println("");
Serial.println("WiFi connected");
Serial.println("IP address: ");
Serial.println(WiFi.localIP());
}
void startHTTPServer() {
//Add API-Methods
add_postRule();
// Start webserver
httpServer.onNotFound(notFound);
httpServer.begin();
}
void add_postRule() {
httpServer.on("/api/postRule", HTTP_POST, [](AsyncWebServerRequest *request){}, NULL, [](AsyncWebServerRequest *request, uint8_t *data, size_t len, size_t index, size_t total){
postRule(request, data);
});
}
void postRule(AsyncWebServerRequest *request, uint8_t *data) {
Rule r = parseRule(request, data);
if (r.ID == -2)
return;
r.ID = 1;
//normally here would be logic to save it all and get a valid id
request->send(200, "text/plain", "Rule added");
}
Rule parseRule(AsyncWebServerRequest *request, uint8_t *data) {
JsonObject obj = deserializeData(request, data);
Rule r;
if (obj.isNull()) {
r.ID = -2;
return r;
}
r.lightID = obj["lightID"];
r.ID = obj["ID"];
Serial.println("ReadingName");
r.name = obj["name"].as<String>();
Serial.print("Regelname: ");
Serial.println(r.name);
r.dateTime = obj["dateTime"];
r.frequency = obj["frequency"];
r.deactivated = obj["deactivated"];
r.action = obj["action"];
printRule(r);
return r;
}
void printRule(Rule& r) {
Serial.print("Rule: LightID: ");
Serial.println(r.lightID);
Serial.print("ID: ");
Serial.println(r.ID);
Serial.print("Name: ");
Serial.println(r.name);
Serial.print("dateTime: ");
Serial.println(r.dateTime);
Serial.print("Frequency: ");
Serial.println(r.frequency);
Serial.print("Deaktivated: ");
Serial.println(r.deactivated);
Serial.print("Action: ");
Serial.println(r.action);
}
JsonObject deserializeData(AsyncWebServerRequest *request, uint8_t *data) {
Serial.println("Data: ");
Serial.println((const char *)data);
Serial.println("Length: ");
Serial.println(request->contentLength());
DynamicJsonDocument doc(2048);
DeserializationError error = deserializeJson(doc, (const char *)data,request->contentLength());
if (error) {
request->send(400, "text/plain", "Fehlerhafte JSON Struktur");
doc.clear();
}
JsonObject obj = doc.as<JsonObject>();
return obj;
}
void notFound(AsyncWebServerRequest *request) {
request->send(404, "text/plain", "Not found");
}
I'm doing my Post via RESTer from Firefox (also tried another client) and get this as on the Serial Monitor
WiFi connected
IP address:
192.168.137.212
connected
Server started
Data:
{
"lightID":1,
"name":"Regelname",
"dateTime":1677427187,
"frequency":1,
"deactivated":2,
"action":3
}
Length:
102
ReadingName
Regelname: null
Rule: LightID: 1
ID: 0
Name: null
dateTime: 0
Frequency: 0
Deaktivated: 0
Action: 0
also sometimes there are wierd thing in the data like in this example:
Data:
{
"lightID":1,
"name":"Regelname 2",
"dateTime":1678427187,
"frequency":1,
"deactivated":2,
"action":3
}c-75e3-4847-ﾭ�xV��0�
Length:
104
ReadingName
Regelname: null
Rule: LightID: 1
ID: 0
Name: null
dateTime: 0
Frequency: 0
Deaktivated: 0
Action: 0
The chars after the curly brackets closed are broken in Arduino IDE too.
As you can see my problem is, that it doesn't read out the data correct although I'm not sending it that way. I'm also not sure where exactly my problem is from, since Webserver as well as ArduinoJson seem to be pretty popular and well tested.
I would apprciate your help!
Thanks.