diff --git a/src/tests/definition.h b/src/tests/definition.h
new file mode 100644
index 0000000..b67eca3
--- /dev/null
+++ b/src/tests/definition.h
@@ -0,0 +1,20 @@
+#ifndef DEFINITION_H
+#define DEFINITION_H
+
+#include "packet_format.h"
+
+//Payload structure
+typedef struct 
+{
+  uint16_t id;
+  HEADER_e header : 6;
+  unsigned int ldr : 10;
+  float battery;
+  float bmpTemp;
+  float bmpPress;
+  float humidity;
+  float compensatedHumidity;
+  float htuTemp;
+} DataPacket __attribute__((__packed__));
+
+#endif //DEFINITION_H
diff --git a/src/tests/packet_format.h b/src/tests/packet_format.h
new file mode 100644
index 0000000..5b35254
--- /dev/null
+++ b/src/tests/packet_format.h
@@ -0,0 +1,6 @@
+#ifndef PACKET_FORMAT_H
+#define PACKET_FORMAT_H
+
+enum HEADER_e {WEATHER_STATION = 0};
+
+#endif //PACKET_FORMAT_H
diff --git a/src/tests/tests.ino b/src/tests/tests.ino
new file mode 100644
index 0000000..078b9f0
--- /dev/null
+++ b/src/tests/tests.ino
@@ -0,0 +1,149 @@
+/**
+ * Author : Anatole SCHRAMM-HENRY
+ * Created the : 13/06/2021
+ * This TEST program aims to verify all the basic functions of the gateway by displaying some output to a serial console :
+ * - Testing that both NRF work correctly
+ * - Testing the LED status lights
+ * - Testing the NRF IRQs detection with the PCF8574
+ */
+
+#include <SPI.h>
+#include <ESP8266WiFi.h>
+#include <PCF8574.h>
+#include "RF24.h"
+#include "definition.h"
+
+
+#define NRF_1_CE 15 //chip enable
+#define NRF_2_CE 16 //chip enable
+
+#define NRF_1_CS 5 //chip select
+#define NRF_2_CS 4 //chip select
+
+#define CHAN 108   //0-125
+#define RECV_CHECK 100 //We test every 100 ms if we received something
+#define WIFI_CHECK_TIMEOUT 20000
+
+DataPacket p;
+
+RF24 NRF_1(NRF_1_CE, NRF_1_CS);
+RF24 NRF_2(NRF_2_CE, NRF_2_CS);
+PCF8574 PCF(0x20);
+
+const uint8_t ADDR[] = "WEST1";
+uint64_t timeStamp(0), recvSlot(0), packetTimeout(0);
+uint32_t freeMem(0);
+uint16_t biggestContigMemBlock(0);
+uint8_t frag(0);
+
+void setup() {
+  //We do not need to read on the serial bus
+  Serial.begin(115200, SERIAL_8N1, SERIAL_TX_ONLY);
+  Serial.println("Setup begin");
+  //To prevent wear and tear on the flash mem
+  WiFi.persistent(false);
+  WiFi.disconnect(true);
+  WiFi.softAPdisconnect(true);
+  
+  Serial.printf("NRF 1 %s\n",NRF_1.begin() ? "started" : "error");
+  if(!NRF_1.isChipConnected())
+    Serial.println("NRF 1 is missing");
+  else
+    Serial.println("NRF 1 is detected");
+    
+  NRF_1.setChannel(CHAN); 
+  NRF_1.setPALevel(RF24_PA_MIN);
+  NRF_1.setDataRate(RF24_250KBPS);
+  NRF_1.setRetries(8,15);
+  NRF_1.openReadingPipe(1, ADDR);
+  NRF_1.startListening();
+
+  Serial.printf("NRF 2 %s\n",NRF_2.begin() ? "started" : "error");
+  if(!NRF_2.isChipConnected())
+    Serial.println("NRF 2 is missing");
+  else
+    Serial.println("NRF 2 is detected");
+    
+  NRF_2.setChannel(CHAN); 
+  NRF_2.setPALevel(RF24_PA_MIN);
+  NRF_2.setDataRate(RF24_250KBPS);
+  NRF_2.setRetries(8,15);
+  NRF_2.openReadingPipe(1, ADDR);
+  NRF_2.startListening();
+
+  memset(&p, 0, sizeof p);
+
+  //Setting the I2C pins and the PCF8574
+  Wire.begin(0,2);
+  Serial.printf("PCF %s\n", PCF.begin() ? "found" : "not found");
+  PCF.pinMode(PCF8574::P2, OUTPUT);
+  PCF.pinMode(PCF8574::P3, OUTPUT);
+  PCF.pinMode(PCF8574::P4, OUTPUT);
+  Serial.println("End setup");
+}
+
+void loop() {
+  // put your main code here, to run repeatedly:
+  if(millis() - recvSlot > RECV_CHECK)
+  {
+    if(NRF_1.available()) //Then we read the incoming data
+    {
+      NRF_1.read(&p, sizeof(p));
+      Serial.printf("NRF 1 Received : \n");
+      debugStruct(&p);
+    }
+    if(NRF_2.available()) //Then we read the incoming data
+    {
+      NRF_2.read(&p, sizeof(p));
+      Serial.printf("NRF 2 Received : \n");
+      debugStruct(&p);
+    }
+    recvSlot = millis();
+  }
+
+  //Here we check if we are still connected
+  if(millis() - timeStamp > WIFI_CHECK_TIMEOUT)
+  {
+    PCF.togglePin(PCF8574::P2);
+    PCF.togglePin(PCF8574::P3);
+    PCF.togglePin(PCF8574::P4);
+    ESP.getHeapStats(&freeMem, &biggestContigMemBlock, &frag);
+    printf("Memory Info :\n - Free Mem > %u\n - Heap frag > %u\n - Max block > %u\n", freeMem, frag, biggestContigMemBlock);
+    timeStamp = millis();
+  }
+}
+
+void debugStruct(DataPacket *p)
+{
+  Serial.println("##############DATA##############");
+  Serial.print("ID : ");
+  Serial.println(p->id);
+
+  Serial.print("HEADER : ");
+  Serial.println(p->header);
+  
+  Serial.printf("BATT :  %.5f V\n", p->battery);
+  
+  Serial.print("LDR : ");
+  Serial.println(p->ldr);
+
+  Serial.print("BMP TEMP : ");
+  Serial.print(p->bmpTemp);
+  Serial.println(" *C");
+  
+  Serial.print("BMP PRESS : ");
+  Serial.print(p->bmpPress);
+  Serial.println(" Pa");
+
+  Serial.print("HUM : ");
+  Serial.print(p->humidity);
+  Serial.println(" %");
+  
+  Serial.print("COM HUM : ");
+  Serial.print(p->compensatedHumidity);
+  Serial.println(" %");
+  
+  Serial.print("HTU TEMP : ");
+  Serial.print(p->htuTemp);
+  Serial.println(" *C");
+}