modify BLE client & server code to include push button & LED

[666hjk]

Hi,
using esp32(server-side) and esp32c3(client-side). 2 push buttons @ client-side to control 2 LED @ server-side for (left and right signal).
Try doing 1 push button to 1 LED , it works. but now with added set of button and LED, it doesn't blink when pressed. both code compile ok.

Can't figure out what went wrong, any advise appreciated. thanks.
Below are the client code, server code, client console output and server console output


=======================================================================================================


#include "BLEDevice.h"
/* Specify the Service UUID of Server */ // client code
static BLEUUID serviceUUID("4fafc201-1fb5-459e-8fcc-c5c9c331914b");
/* Specify the Characteristic UUID of Server */
static BLEUUID charUUID("beb5483e-36e1-4688-b7f5-ea07361b26a8");

static boolean doConnect = false;
static boolean connected = false;
static boolean doScan = false;
static BLERemoteCharacteristic* pRemoteCharacteristic;
static BLEAdvertisedDevice* myDevice;

int buttonStateL ;
int buttonStateR ;

#define buttonL 18
#define buttonR 19

static void notifyCallback(BLERemoteCharacteristic* pBLERemoteCharacteristic,
uint8_t* pData, size_t length, bool isNotify)
{
Serial.print("Notify callback for characteristic ");
Serial.print(pBLERemoteCharacteristic->getUUID().toString().c_str());
Serial.print(" of data length ");
Serial.println(length);
Serial.print("data: ");
Serial.println((char*)pData);
}

class MyClientCallback : public BLEClientCallbacks
{
void onConnect(BLEClient* pclient)
{
}
void onDisconnect(BLEClient* pclient)
{
connected = false;
Serial.println("onDisconnect");
}
};

/* Start connection to the BLE Server */
bool connectToServer()
{
Serial.print("Forming a connection to ");
Serial.println(myDevice->getAddress().toString().c_str());
BLEClient* pClient = BLEDevice::createClient();
Serial.println(" - Created client");
pClient->setClientCallbacks(new MyClientCallback());
/* Connect to the remote BLE Server */
pClient->connect(myDevice); // if you pass BLEAdvertisedDevice instead of address, it will be recognized type of peer device address (public or private)
Serial.println(" - Connected to server");
/* Obtain a reference to the service we are after in the remote BLE server */
BLERemoteService* pRemoteService = pClient->getService(serviceUUID);
if (pRemoteService == nullptr)
{
Serial.print("Failed to find our service UUID: ");
Serial.println(serviceUUID.toString().c_str());
pClient->disconnect();
return false;
}
Serial.println(" - Found our service");
/* Obtain a reference to the characteristic in the service of the remote BLE server */
pRemoteCharacteristic = pRemoteService->getCharacteristic(charUUID);
if (pRemoteCharacteristic == nullptr)
{
Serial.print("Failed to find our characteristic UUID: ");
Serial.println(charUUID.toString().c_str());
pClient->disconnect();
return false;
}
Serial.println(" - Found our characteristic");
/* Read the value of the characteristic */
/* Initial value is 'Hello, World!' */
if (pRemoteCharacteristic->canRead())
{
std::string value = pRemoteCharacteristic->readValue();
Serial.print("The characteristic value was: ");
Serial.println(value.c_str());
}
if (pRemoteCharacteristic->canNotify())
{
pRemoteCharacteristic->registerForNotify(notifyCallback);
}
connected = true;
return true;
}

/* Scan for BLE servers and find the first one that advertises the service we are looking for. */
class MyAdvertisedDeviceCallbacks: public BLEAdvertisedDeviceCallbacks
{
/* Called for each advertising BLE server. */
void onResult(BLEAdvertisedDevice advertisedDevice)
{
Serial.print("BLE Advertised Device found: ");
Serial.println(advertisedDevice.toString().c_str());
/* We have found a device, let us now see if it contains the service we are looking for. */
if (advertisedDevice.haveServiceUUID() && advertisedDevice.isAdvertisingService(serviceUUID))
{
BLEDevice::getScan()->stop();
myDevice = new BLEAdvertisedDevice(advertisedDevice);
doConnect = true;
doScan = true;
}
}
};

void setup()
{
Serial.begin(115200);
Serial.println("Starting Arduino BLE Client application...");
BLEDevice::init("ESP32-BLE-Client");

pinMode(buttonL, INPUT_PULLUP);
pinMode(buttonR, INPUT_PULLUP);

/* Retrieve a Scanner and set the callback we want to use to be informed when we
have detected a new device. Specify that we want active scanning and start the
scan to run for 5 seconds. */
BLEScan* pBLEScan = BLEDevice::getScan();
pBLEScan->setAdvertisedDeviceCallbacks(new MyAdvertisedDeviceCallbacks());
pBLEScan->setInterval(1349);
pBLEScan->setWindow(449);
pBLEScan->setActiveScan(true);
pBLEScan->start(5, false);
}

void loop()
{
/* If the flag "doConnect" is true, then we have scanned for and found the desired
BLE Server with which we wish to connect. Now we connect to it. Once we are
connected we set the connected flag to be true. */
if (doConnect == true)
{
if (connectToServer())
{
Serial.println("We are now connected to the BLE Server.");
}
else
{
Serial.println("We have failed to connect to the server; there is nothin more we will do.");
}
doConnect = false;
}
/* If we are connected to a peer BLE Server, update the characteristic each time we are reached
with the current time since boot */
if (connected)
{
String newValue = "";
int buttonStateL = digitalRead(buttonL);
int buttonStateR = digitalRead(buttonR);


if (buttonStateL == LOW)
{
newValue = "left";
}


if (buttonStateR == LOW)
{
newValue = "right";
}


if (buttonStateL || buttonStateR == HIGH)
{
newValue = "no signal";
}

/* Set the characteristic's value to be the array of bytes that is actually a string */
pRemoteCharacteristic->writeValue(newValue.c_str(), newValue.length());
/* You can see this value updated in the Server's Characteristic */
}
else if (doScan)
{
BLEDevice::getScan()->start(0); // better way to do it in arduino
}
// this is just example to start scan after disconnect, most likely there is
delay(2000); /* Delay a second between loops */
}

===============================================================================================================

#include <BLEDevice.h>
#include <BLEUtils.h>
#include <BLEServer.h>

// See the following for generating UUIDs: // Server code
// https://www.uuidgenerator.net/

#define SERVICE_UUID "4fafc201-1fb5-459e-8fcc-c5c9c331914b"
#define CHARACTERISTIC_UUID "beb5483e-36e1-4688-b7f5-ea07361b26a8"

#define led_Left 2
#define led_Right 4

BLEServer *pServer;
BLEService *pService;
BLECharacteristic *pCharacteristic;


void setup()
{
Serial.begin(115200);
Serial.println("Starting BLE Server!");

BLEDevice::init("ESP32-BLE-Server");
pServer = BLEDevice::createServer();
pService = pServer->createService(SERVICE_UUID);
pCharacteristic = pService->createCharacteristic(
CHARACTERISTIC_UUID,
BLECharacteristic::PROPERTY_READ |
BLECharacteristic::PROPERTY_WRITE
);

pinMode(led_Left,OUTPUT);
pinMode(led_Right,OUTPUT);

pCharacteristic->setValue("Waiting for signal!");
pService->start();
//BLEAdvertising *pAdvertising = pServer->getAdvertising();
BLEAdvertising *pAdvertising = BLEDevice::getAdvertising();
pAdvertising->addServiceUUID(SERVICE_UUID);
pAdvertising->setScanResponse(true);
pAdvertising->setMinPreferred(0x06); // functions that help with iPhone connections issue
pAdvertising->setMinPreferred(0x12);
BLEDevice::startAdvertising();
//pAdvertising->start();
Serial.println("Characteristic defined! Now you can read it in the Client!");
}

void loop()
{
std::string value = pCharacteristic->getValue(); // string type
Serial.print("The new characteristic value is: ");
Serial.println(value.c_str()); // This array includes the same sequence of characters that make up the value
// of the basic_string object plus an additional terminating null-character at the end.

if(value == "left" ) // comparison must be string to string, that's why it works
{
digitalWrite(led_Left,HIGH);
delay(10);
digitalWrite(led_Left,LOW);
delay(10);
digitalWrite(led_Left,HIGH);
delay(10);
digitalWrite(led_Left,LOW);
delay(10);
digitalWrite(led_Left,HIGH);
delay(10);
digitalWrite(led_Left,LOW);
delay(10);
};

if(value == "right") // comparison must be string to string, that's why it works
{
digitalWrite(led_Right,HIGH);
delay(10);
digitalWrite(led_Right,LOW);
delay(10);
digitalWrite(led_Right,HIGH);
delay(10);
digitalWrite(led_Right,LOW);
delay(10);
digitalWrite(led_Right,HIGH);
delay(10);
digitalWrite(led_Right,LOW);
delay(10);
};

delay(50);
}


=======================================================================================================
// client-side console output
23:51:20.608 -> ESP-ROM:esp32c3-api1-20210207
23:51:20.608 -> Build:Feb 7 2021
23:51:20.608 -> rst:0x1 (POWERON),boot:0xc (SPI_FAST_FLASH_BOOT)
23:51:21.129 -> SPIWP:0xee
23:51:21.129 -> mode:DIO, clock div:1
23:51:21.129 -> load:0x3fcd6100,len:0x420
23:51:21.129 -> load:0x403ce000,len:0x90c
23:51:21.129 -> load:0x403d0000,len:0x236c
23:51:21.129 -> SHA-256 comparison failed:
23:51:21.129 -> Calculated: ccb0d00bac7d84e1d90a12e4f75f4ab6c5f7e71bb209afd5819c4c9557a6db71
23:51:21.129 -> Expected: c9cf160580940cc7801c73b16423824e72ad12055c732e83ce66332240af42a7
23:51:21.129 -> Attempting to boot anyway...
23:51:21.129 -> entry 0x403ce000
23:51:21.129 -> Starting Arduino BLE Client application...
23:51:21.129 -> BLE Advertised Device found: Name: , Address: d7:50:14:5e:ef:9f, manufacturer data: 4c0012020002
23:51:21.129 -> BLE Advertised Device found: Name: , Address: 6d:96:b2:cf:92:33, manufacturer data: ff03363663, serviceUUID: b82ab3fc-2595-4f6a-80f0-fe094cc218f9, txPower: -3
23:51:21.129 -> BLE Advertised Device found: Name: , Address: 73:15:df:7b:b8:98, serviceUUID: 0000ffff-0000-1000-8000-00805f9b34fb
23:51:21.129 -> BLE Advertised Device found: Name: , Address: 10:86:6d:82:6d:8e, manufacturer data: 060001092002f23bd73c64c371a12a3f7d7884a2a749ae2a2228d2502c
23:51:21.129 -> BLE Advertised Device found: Name: ESP32-BLE-Server, Address: 44:6f:28:6b:b6:d2, serviceUUID: 4fafc201-1fb5-459e-8fcc-c5c8c331914b, txPower: 3
23:51:21.129 -> Forming a connection to 44:6f:28:6b:b6:d2
23:51:21.358 -> - Created client
23:51:21.358 -> - Connected to server
23:51:22.033 -> - Found our service
23:51:22.033 -> - Found our characteristic
23:51:22.351 -> The characteristic value was: Waiting for signal!
23:51:22.351 -> We are now connected to the BLE Server.

=======================================================================================================

// server-side output
23:54:21.027 -> The new characteristic value is: no signal
23:54:21.095 -> The new characteristic value is: no signal
23:54:21.128 -> The new characteristic value is: no signal
23:54:21.161 -> The new characteristic value is: no signal
23:54:21.227 -> The new characteristic value is: no signal
23:54:21.470 -> The new characteristic value is: no signal
23:54:21.470 -> The new characteristic value is: no signal
23:54:21.470 -> The new characteristic value is: no signal
23:54:21.470 -> The new characteristic value is: no signal
23:54:21.470 -> The new characteristic value is: no signal
23:54:21.525 -> The new characteristic value is: no signal
23:54:21.591 -> The new characteristic value is: no signal
23:54:21.624 -> The new characteristic value is: no signal
23:54:21.691 -> The new characteristic value is: no signal
23:54:21.724 -> The new characteristic value is: no signal
23:54:21.790 -> The new characteristic value is: no signal
23:54:21.823 -> The new characteristic value is: no signal
23:54:21.889 -> The new characteristic value is: no signal
23:54:21.923 -> The new characteristic value is: no signal
23:54:21.989 -> The new characteristic value is: no signal
23:54:22.022 -> The new characteristic value is: no signal
23:54:22.088 -> The new characteristic value is: no signal
23:54:22.121 -> The new characteristic value is: no signal
23:54:22.187 -> The new characteristic value is: no signal
23:54:22.221 -> The new characteristic value is: no signal


========================================================================================================

[666hjk]

problem solved after checking all the connection to esp32c3.