ESP32 Forum

Posted: **Fri Jul 10, 2020 5:51 pm**

Hello,

I have prepared a Test BLE Server to rebuild a LEGO HUB, Test is for Advertising only
Examle code:

Code: [Select all] [Expand/Collapse]

 
*
    Based on Neil Kolban example for IDF: https://github.com/nkolban/esp32-snippets/blob/master/cpp_utils/tests/BLE%20Tests/SampleServer.cpp
    Ported to Arduino ESP32 by Evandro Copercini
    updates by chegewara
*/
#include <Arduino.h>
 
#include <BLEDevice.h>
#include <BLEUtils.h>
#include <BLEServer.h>
 
// See the following for generating UUIDs:
// https://www.uuidgenerator.net/
 
#define SERVICE_UUID        "00001623-1212-EFDE-1623-785FEABCD123"
#define CHARACTERISTIC_UUID "00001624-1212-EFDE-1623-785FEABCD123"
BLEAdvertisementData oAdvertisementData = BLEAdvertisementData();
//BLEAdvertisementData oScanResponseData = BLEAdvertisementData();
 
const char advLEGO[] = {0x02,0x01,0x06,0x11,0x07,0x23,0xD1,0xBC,0xEA,0x5F,0x78,0x23,0x16,0xDE,0xEF,
                          0x12,0x12,0x23,0x16,0x00,0x00,0x09,0xFF,0x97,0x03,0x00,0x80,0x06,0x00,0x61,0x00};                    
 
 char  ManufacturerData[8] = {0x97,0x03,0x00,0x80,0x06,0x00,0x61,0x00};
 
  
 
void setup() {
  
 
  Serial.begin(115200);
  Serial.println("Starting BLE work!");
 
  BLEDevice::init("Long name works now");
  BLEServer *pServer = BLEDevice::createServer();
  BLEService *pService = pServer->createService(SERVICE_UUID);
  BLECharacteristic *pCharacteristic = pService->createCharacteristic(
                                         CHARACTERISTIC_UUID,
                                         BLECharacteristic::PROPERTY_READ |
                                         BLECharacteristic::PROPERTY_WRITE
                                       );
 
  pCharacteristic->setValue("Hello World says Neil");
  pService->start();
  // BLEAdvertising *pAdvertising = pServer->getAdvertising();  // this still is working for backward compatibility
  BLEAdvertising *pAdvertising = BLEDevice::getAdvertising();
  pAdvertising->addServiceUUID(SERVICE_UUID);
 
   pAdvertising->setScanResponse(true);
  
  
oAdvertisementData.setShortName("Lego Hub");
oAdvertisementData.setManufacturerData(ManufacturerData);
pAdvertising->setAdvertisementData(oAdvertisementData);
 
  pAdvertising->setMinPreferred(0x06);  // functions that help with iPhone connections issue
  pAdvertising->setMinPreferred(0x12);
 
  BLEDevice::startAdvertising();
  Serial.println("Characteristic defined! Now you can read it in your phone!");
}
 
void loop() {
  // put your main code here, to run repeatedly:
  delay(2000);
}

GeSHi © Codebox Plus Extension

Goal ist that scan and connect result from BLE Client is as follows like with original LEGO HUB:

Scanning ...<CR><LF>
[ADV 596] Packet received from 90:84:2B:4A:3A:0C<LF>
PAYLOAD 31 bytes<LF>
02-01-06-11-07-23-D1-BC-EA-5F-78-23-16-DE-EF-12-12-23-16-00-00-09-FF-97-03-00-80-06-00-41-00<CR><LF>
RSSI -29 dBm<LF>
ADV TYPE Connectable undirected<CR><LF>
128-Bit UUID #Ñ¼ê_x#<SYN>Þï<DC2><DC2>#<SYN>00001623-1212-EFDE-1623-785FEABCD123<CR><LF>
LEGO BLE SERVICE UUID Found!<LF>
MAN SPEC DATA 97-03-00-80-06-00-41-00<CR><LF>
<CR><LF>
Connected<CR><LF>
Discovering LEGO HUB Service ... Found LEGO HUB Service <CR><LF>
Discovering characteristic ... Found LEGO Data Characteristic<CR><LF>

The result of my code from Above is like :

Scanning ...<CR><LF>
[ADV 655] Packet received from BC:DD:C2:CB:69:FA<LF>
PAYLOAD 14 bytes<LF>
09-08-4C-65-67-6F-20-48-75-62-03-FF-97-03<CR><LF>
RSSI -31 dBm<LF>
ADV TYPE Connectable undirected<CR><LF>
SHORT NAME Lego Hub<LF>
MAN SPEC DATA 97-03<CR><LF>
<CR><LF>
Connected<CR><LF>
Discovering LEGO HUB Service ... Found LEGO HUB Service <CR><LF>
Discovering characteristic ... Found LEGO Data Characteristic<CR><LF>

Question is Why ?

Thanks in advance

MArc

Posted: **Fri Jul 10, 2020 6:05 pm**

An addition:
My Advertisment data is like:

const char advLEGO[] = {0x02,0x01,0x06,0x11,0x07,0x23,0xD1,0xBC,0xEA,0x5F,0x78,0x23,0x16,0xDE,0xEF,
0x12,0x12,0x23,0x16,0x00,0x00,0x09,0xFF,0x97,0x03,0x00,0x80,0x06,0x00,0x61,0x00};

When i change code like:

oAdvertisementData.addData(advLEGO);
oAdvertisementData.setManufacturerData(ManufacturerData);
pAdvertising->setAdvertisementData(oAdvertisementData);

i got another strange result :

Scanning ...<CR><LF>
[ADV 1244] Packet received from BC:DD:C2:CB:69:FA<LF>
PAYLOAD 29 bytes<LF>
09-08-4C-65-67-6F-20-48-75-62-02-01-06-11-07-23-D1-BC-EA-5F-78-23-16-DE-EF-12-12-23-16<CR><LF>
RSSI -33 dBm<LF>
ADV TYPE Connectable undirected<CR><LF>
SHORT NAME Lego Hub<LF>
128-Bit UUID #Ñ¼ê_x#<SYN>Þï<DC2><DC2>#<SYN>00001623-1212-EFDE-1623-785FEABCD123<CR><LF>
LEGO BLE SERVICE UUID Found!<LF><CR>
<LF>
Connected<CR><LF>
Discovering LEGO HUB Service ... Found LEGO HUB Service <CR><LF>

Question:
Where is the mistake not getting target result like;

Bluefruit52 Central LEGO Scan Example<CR><LF>
------------------------------------<LF><CR>
<LF>
Scanning ...<CR><LF>
[ADV 473] Packet received from 90:84:2B:4A:3A:0C<LF>
PAYLOAD 31 bytes<LF>
02-01-06-11-07-23-D1-BC-EA-5F-78-23-16-DE-EF-12-12-23-16-00-00-09-FF-97-03-00-80-06-00-41-00<CR><LF>
RSSI -28 dBm<LF>
ADV TYPE Connectable undirected<CR><LF>
128-Bit UUID #Ñ¼ê_x#<SYN>Þï<DC2><DC2>#<SYN>00001623-1212-EFDE-1623-785FEABCD123<CR><LF>
LEGO BLE SERVICE UUID Found!<LF>
MAN SPEC DATA 97-03-00-80-06-00-41-00<CR><LF>
<CR><LF>
Connected<CR><LF>
Discovering LEGO HUB Service ... Found LEGO HUB Service <CR><LF>

Marc

Posted: **Mon Jul 13, 2020 3:24 am**

Here is error:

Code: Select all

char  ManufacturerData[8] = {0x97,0x03,0x00,0x80,0x06,0x00,0x61,0x00};

char string is 0x0 terminated.
std::string is not.

Here is simple test code:

Code: Select all

#include <string>

char  ManufacturerData[8] = {0x97,0x03,0x00,0x80,0x06,0x00,0x61,0x00};
std::string test(ManufacturerData, 8);
void setup() {
  // put your setup code here, to run once:
Serial.begin(115200);
delay(100);
Serial.print("char length: ");
Serial.println(strlen(ManufacturerData));
Serial.print("std::string length: ");
Serial.println(test.length());
}

void loop() {
  // put your main code here, to run repeatedly:

}

Output:

Code: Select all

char length: 2
std::string length: 8

ESP32 Forum

BLE Server, problems with custom advertisement and manufacturer data

BLE Server, problems with custom advertisement and manufacturer data

Re: BLE Server, problems with custom advertisement and manufacturer data

Re: BLE Server, problems with custom advertisement and manufacturer data