Hi I'm new to Django framework and I am on a project on which to send http.POST data from NodeMCU to the web application using the Django Framework and the sent data is a string ID of the RFID card.
I want to render the POST data sent by the NodeMCU to the textarea in the template below. I dont know how to handle http.POST sent by the NodeMCU using the Django Framework.
I tested the views functions and it rendered data to the templates. I don't if the data is successfully sent or received.
Arduino version 1.8.13
Django version 3.1.4
Any help would be appreciated
views.py
from django.shortcuts import render
# Create your views here.
def card_reg(request):
id = request.POST.get('UIDresult', 'whatever')
context = {
'id': id
}
return render(request, 'nodemcuapp/card_reg.html', context)
templates/card_reg.html
'''
{% extends 'nodemcuapp/main.html' %}
{%block content%}
<div class="container">
<br>
<div class="center" style="margin: 0 auto; width:495px; border-style: solid; border-color: #f2f2f2;">
<h3 align="center" class="text-primary">Registration Form</h3>
<br>
<form action=" " method="POST" >
{%csrf_token%}
<div class="form-group">
<label class="text-primary">ID</label>
<div>
<textarea class="form-control" name="id" id="getUID" placeholder="Please Tag your Card to display ID" rows="1" cols="1" required>{{id}}</textarea>
</div>
</div>
<div>
<label class="text-primary">Name</label>
<div>
<input class="form-control" id="div_refresh" name="name" type="text" placeholder="" required>
</div>
</div>
<div class="form-group">
<label class="text-primary">Email Address</label>
<div>
<input class="form-control" name="email" type="text" placeholder="" required>
</div>
</div>
<div class="row">
<div class="col-md-7">
<label class="text-primary">Mobile Number</label>
<div>
<input class="form-control" name="mobile" type="text" placeholder="" required>
</div>
</div>
<div class="col-md-5">
<label class="text-primary">Select</label>
<select class="custom-select mr-sm-2" id="inlineFormCustomSelect">
<option selected>Gender</option>
<option value="Male">Male</option>
<option value="Female">Female</option>
</select>
</div>
</div>
<div class="form-group">
<button type="submit" class="btn btn-primary form-control">Save</button>
</div>
</form>
</div>
</div>
{%endblock%}
'''
nodemcuapp/urls.py
from django.urls import path
from . import views
urlpatterns = [
path('', views.home, name='home'),
path('user_data', views.user_data, name='user_data'),
path('card_registration/', views.card_reg, name='card_reg'),
path('read_card', views.card_read, name='card_read'),
]
Arduino_code.ino
#include <ESP8266WebServer.h>
#include <ESP8266HTTPClient.h>
#include <SPI.h>
#include <MFRC522.h>
#define SS_PIN D2 //--> SDA / SS is connected to pinout D2
#define RST_PIN D1 //--> RST is connected to pinout D1
MFRC522 mfrc522(SS_PIN, RST_PIN); //--> Create MFRC522 instance.
#define ON_Board_LED 2 //--> Defining an On Board LED, used for indicators when the process of connecting to a wifi router
const char* ssid = "my_ssid";
const char* password = "my_password";
ESP8266WebServer server(80); //--> Server on port 80
int readsuccess;
byte readcard[4];
char str[32] = "";
String StrUID;
void setup() {
Serial.begin(115200); //--> Initialize serial communications with the PC
SPI.begin(); //--> Init SPI bus
mfrc522.PCD_Init(); //--> Init MFRC522 card
delay(500);
WiFi.begin(ssid, password); //--> Connect to your WiFi router
Serial.println("");
pinMode(ON_Board_LED,OUTPUT);
digitalWrite(ON_Board_LED, HIGH); //--> Turn off Led On Board
Serial.print("Connecting");
while (WiFi.status() != WL_CONNECTED) {
Serial.print(".");
digitalWrite(ON_Board_LED, LOW);
delay(250);
digitalWrite(ON_Board_LED, HIGH);
delay(250);
}
digitalWrite(ON_Board_LED, HIGH);
Serial.println("");
Serial.print("Successfully connected to : ");
Serial.println(ssid);
Serial.print("IP address: ");
Serial.println(WiFi.localIP());
Serial.println("Please tag a card to display UID !");
Serial.println("");
}
void loop() {
// put your main code here, to run repeatedly
readsuccess = getid();
if(readsuccess) {
digitalWrite(ON_Board_LED, LOW);
HTTPClient http; //Declare object of class HTTPClient
String UIDresultSend, postData;
UIDresultSend = StrUID;
Serial.println(UIDresultSend);
//Post Data
postData = "UIDresult=" + UIDresultSend;
http.begin("http://192.168.1.8:8080/card_registration/"); //Specify request destination
http.addHeader("Content-Type", "application/x-www-form-urlencoded"); //Specify content-type header
int httpCode = http.POST(postData); //Send the request
String payload = http.getString(); //Get the response payload
Serial.println("");
Serial.println(httpCode); //Print HTTP return code
Serial.println(payload); //Print request response payload
http.end(); //Close connection
delay(1000);
digitalWrite(ON_Board_LED, HIGH);
}
}
int getid() {
if(!mfrc522.PICC_IsNewCardPresent()) {
return 0;
}
if(!mfrc522.PICC_ReadCardSerial()) {
return 0;
}
for(int i=0;i<4;i++){
readcard[i]=mfrc522.uid.uidByte[i]; //storing the UID of the tag in readcard
array_to_string(readcard, 4, str);
StrUID = str;
}
Serial.println("");
Serial.print("THE UID OF THE SCANNED CARD IS : ");
mfrc522.PICC_HaltA();
return 1;
}
void array_to_string(byte array[], unsigned int len, char buffer[]) {
for (unsigned int i = 0; i < len; i++)
{
byte nib1 = (array[i] >> 4) & 0x0F;
byte nib2 = (array[i] >> 0) & 0x0F;
buffer[i*2+0] = nib1 < 0xA ? '0' + nib1 : 'A' + nib1 - 0xA;
buffer[i*2+1] = nib2 < 0xA ? '0' + nib2 : 'A' + nib2 - 0xA;
}
buffer[len*2] = '\0';
}
You need to create a forms.py to make it work on your views.py for this follow up the instructions below.
forms.py
from django import forms
class SaveForm(forms.Form):
UIDresult = forms.CharField(label='UIDresult', max_length=200)
views.py
from django.http import HttpResponse
from django.views.decorators.csrf import csrf_exempt
# Note please import forms.py here ....
@csrf_exempt
def card_registrations(request):
form = SaveForm(request.POST)
context = {
id: form.cleaned_data.get('UIDresult'),
}
return render(request, 'nodemcuapp/card_reg.html', context)