BLE characteristic readValue cannot reliably read data

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lightingghost
Posts: 3
Joined: Thu Aug 20, 2020 8:28 pm

BLE characteristic readValue cannot reliably read data

Postby lightingghost » Thu Aug 20, 2020 8:40 pm

I am trying to read the value from a characteristic of a BLE device. The code

Code: Select all

#include <Arduino.h>
#include "BLEDevice.h"
//#include "BLEScan.h"

static const char* TAG = "CtrlMain";

static BLEUUID heightServiceUUID("99fa0020-338a-1024-8a49-009c0215f78a");
static BLEUUID heightCharUUID("99fa0021-338a-1024-8a49-009c0215f78a");
static BLEUUID motionServiceUUID("99fa0001-338a-1024-8a49-009c0215f78a");
static BLEUUID motionCharUUID("99fa0002-338a-1024-8a49-009c0215f78a");


static BLEAddress deskAddress("e2:70:5c:5b:d3:26");

static boolean connected = false;
static BLERemoteCharacteristic* pHeightCharacteristic;
static BLERemoteCharacteristic* pMotionCharacteristic;
static BLEAdvertisedDevice* desk;

typedef struct {
  uint16_t height;
  int16_t speed;
} MotionData, *PMotionData;

static void notifyCallback(
  BLERemoteCharacteristic* pBLERemoteCharacteristic,
  uint8_t* pData,
  size_t length,
  bool isNotify) {
    log_i("Notify callback for characteristic %s",
          pBLERemoteCharacteristic->getUUID().toString().c_str());
    if (pBLERemoteCharacteristic->getUUID().toString() != heightCharUUID.toString()) {
      return;
    }

    PMotionData motion = (PMotionData) pData;

    log_i("Height: %d, Speed: %d", motion->height, motion->speed);
}

static int16_t readHeight() {
  if (pHeightCharacteristic == nullptr) return -1;
  //std::string val = pHeightCharacteristic->readValue();
  std::string val2 = pHeightCharacteristic->readValue(); 

  PMotionData motion = (PMotionData) val2.c_str();

  log_d("Height: %d, Speed: %d", motion->height, motion->speed);
  return motion->height;
}

class MyClientCallback : public BLEClientCallbacks {
  void onConnect(BLEClient* pclient) {
  }

  void onDisconnect(BLEClient* pclient) {
    connected = false;
    log_i("onDisconnect");
  }
};

bool connectToServer() {
    log_i("Forming a connection to %s", deskAddress.toString().c_str());
    
    BLEClient*  pClient  = BLEDevice::createClient();
    log_i("Created client");

    pClient->setClientCallbacks(new MyClientCallback());

    pClient->connect(deskAddress, BLE_ADDR_TYPE_RANDOM);
    log_i("Connected to server");

    // Obtain a reference to the service we are after in the remote BLE server.
    BLERemoteService* pRemoteService = pClient->getService(heightServiceUUID);
    if (pRemoteService == nullptr) {
      Serial.print("Failed to find our service UUID: ");
      Serial.println(heightServiceUUID.toString().c_str());
      pClient->disconnect();
      return false;
    }
    log_i("Found height service");


    // Obtain a reference to the characteristic in the service of the remote BLE server.
    pHeightCharacteristic = pRemoteService->getCharacteristic(heightCharUUID);
    if (pHeightCharacteristic == nullptr) {
      Serial.print("Failed to find our characteristic UUID: ");
      Serial.println(heightCharUUID.toString().c_str());
      pClient->disconnect();
      return false;
    }
    log_i("Found height characteristic");

    if(pHeightCharacteristic->canNotify()){
      log_i("Set height characteristic notify");
      pHeightCharacteristic->registerForNotify(notifyCallback);
    }

    if (pHeightCharacteristic->canRead()) {
      log_i("Can read Height");
      readHeight();
      uint8_t* rawData = pHeightCharacteristic->readRawData();
      if (rawData != nullptr) {
        Serial.println((char*)rawData);
      }
    }

    connected = true;
    // pClient->disconnect();
    return true;
}


void setup() {
  Serial.begin(115200);
  esp_log_level_set("*", ESP_LOG_ERROR);
  esp_log_level_set("CtrlMain", ESP_LOG_VERBOSE);
  // esp_log_level_set("bluetooth", ESP_LOG_VERBOSE);
  log_i("Starting Arduino BLE Client application...");
  BLEDevice::init("");

  connectToServer();
} // End of setup.


// This is the Arduino main loop function.
void loop() {

  if (connected) {
    String newValue = "Time since boot: " + String(millis()/1000);
    Serial.println("Setting new characteristic value to \"" + newValue + "\"");
    
  }
  
  delay(1000); // Delay a second between loops.
} // End of loop
Sometimes it can read the characteristic value, with the log of

Code: Select all

[I][ikea_desk.ino:126] setup(): Starting Arduino BLE Client application...
[I][ikea_desk.ino:70] connectToServer(): Forming a connection to e2:70:5c:5b:d3:26
[V][BLEDevice.cpp:60] createClient(): >> createClient
[V][BLEDevice.cpp:66] createClient(): << createClient
[I][ikea_desk.ino:73] connectToServer(): Created client
[V][BLEClient.cpp:96] connect(): >> connect(e2:70:5c:5b:d3:26)
[I][BLEDevice.cpp:593] addPeerDevice(): add conn_id: 0, GATT role: client
[D][FreeRTOS.cpp:189] take(): Semaphore taking: name: RegEvt (0x3ffdd16c), owner: <N/A> for connect
[D][FreeRTOS.cpp:198] take(): Semaphore taken:  name: RegEvt (0x3ffdd16c), owner: connect
[V][FreeRTOS.cpp:63] wait(): >> wait: Semaphore waiting: name: RegEvt (0x3ffdd16c), owner: connect for connect
[V][BLEUtils.cpp:951] gattClientEventTypeToString(): Unknown GATT Client event type: 0
[D][BLEDevice.cpp:148] gattClientEventHandler(): gattClientEventHandler [esp_gatt_if: 4] ... Unknown
[V][BLEUtils.cpp:951] gattClientEventTypeToString(): Unknown GATT Client event type: 0
[V][BLEUtils.cpp:1283] dumpGattClientEvent(): GATT Event: Unknown
[V][BLEUtils.cpp:951] gattClientEventTypeToString(): Unknown GATT Client event type: 0
[D][BLEClient.cpp:158] gattClientEventHandler(): gattClientEventHandler [esp_gatt_if: 4] ... Unknown
[V][FreeRTOS.cpp:143] give(): Semaphore giving: name: RegEvt (0x3ffdd16c), owner: connect
[V][FreeRTOS.cpp:77] wait(): << wait: Semaphore released: name: RegEvt (0x3ffdd16c), owner: <N/A>
[D][FreeRTOS.cpp:189] take(): Semaphore taking: name: OpenEvt (0x3ffdd3c0), owner: <N/A> for connect
[D][FreeRTOS.cpp:198] take(): Semaphore taken:  name: OpenEvt (0x3ffdd3c0), owner: connect
[V][FreeRTOS.cpp:63] wait(): >> wait: Semaphore waiting: name: OpenEvt (0x3ffdd3c0), owner: connect for connect
[V][BLEUtils.cpp:951] gattClientEventTypeToString(): Unknown GATT Client event type: 40
[D][BLEDevice.cpp:148] gattClientEventHandler(): gattClientEventHandler [esp_gatt_if: 4] ... Unknown
[V][BLEUtils.cpp:951] gattClientEventTypeToString(): Unknown GATT Client event type: 40
[V][BLEUtils.cpp:1283] dumpGattClientEvent(): GATT Event: Unknown
[V][BLEUtils.cpp:951] gattClientEventTypeToString(): Unknown GATT Client event type: 40
[D][BLEClient.cpp:158] gattClientEventHandler(): gattClientEventHandler [esp_gatt_if: 4] ... Unknown
[D][BLEDevice.cpp:577] updatePeerDevice(): update conn_id: 4, GATT role: client
[V][BLEUtils.cpp:951] gattClientEventTypeToString(): Unknown GATT Client event type: 2
[D][BLEDevice.cpp:148] gattClientEventHandler(): gattClientEventHandler [esp_gatt_if: 4] ... Unknown
[V][BLEUtils.cpp:951] gattClientEventTypeToString(): Unknown GATT Client event type: 2
[V][BLEUtils.cpp:1283] dumpGattClientEvent(): GATT Event: Unknown
[V][BLEUtils.cpp:951] gattClientEventTypeToString(): Unknown GATT Client event type: 2
[D][BLEClient.cpp:158] gattClientEventHandler(): gattClientEventHandler [esp_gatt_if: 4] ... Unknown
[V][FreeRTOS.cpp:143] give(): Semaphore giving: name: OpenEvt (0x3ffdd3c0), owner: connect
[V][FreeRTOS.cpp:77] wait(): << wait: Semaphore released: name: OpenEvt (0x3ffdd3c0), owner: <N/A>
[V][BLEClient.cpp:129] connect(): << connect(), rc=1
[I][ikea_desk.ino:78] connectToServer(): Connected to server
[V][BLEClient.cpp:377] getService(): >> getService: uuid: 99fa0020-338a-1024-8a49-009c0215f78a
[V][BLEClient.cpp:413] getServices(): >> getServices
[V][BLEClient.cpp:71] clearServices(): >> clearServices
[V][BLEClient.cpp:78] clearServices(): << clearServices
[D][FreeRTOS.cpp:189] take(): Semaphore taking: name: SearchCmplEvt (0x3ffdd420), owner: <N/A> for getServices
[D][FreeRTOS.cpp:198] take(): Semaphore taken:  name: SearchCmplEvt (0x3ffdd420), owner: getServices
[V][FreeRTOS.cpp:63] wait(): >> wait: Semaphore waiting: name: SearchCmplEvt (0x3ffdd420), owner: getServices for getServices
[V][BLEUtils.cpp:951] gattClientEventTypeToString(): Unknown GATT Client event type: 7
[D][BLEDevice.cpp:148] gattClientEventHandler(): gattClientEventHandler [esp_gatt_if: 4] ... Unknown
[V][BLEUtils.cpp:951] gattClientEventTypeToString(): Unknown GATT Client event type: 7
[V][BLEUtils.cpp:1283] dumpGattClientEvent(): GATT Event: Unknown
[V][BLEUtils.cpp:951] gattClientEventTypeToString(): Unknown GATT Client event type: 7
[D][BLEClient.cpp:158] gattClientEventHandler(): gattClientEventHandler [esp_gatt_if: 4] ... Unknown
[V][BLERemoteService.cpp:26] BLERemoteService(): >> BLERemoteService()
[V][BLERemoteService.cpp:34] BLERemoteService(): << BLERemoteService()
[V][BLEUtils.cpp:951] gattClientEventTypeToString(): Unknown GATT Client event type: 7
[D][BLEDevice.cpp:148] gattClientEventHandler(): gattClientEventHandler [esp_gatt_if: 4] ... Unknown
[V][BLEUtils.cpp:951] gattClientEventTypeToString(): Unknown GATT Client event type: 7
[V][BLEUtils.cpp:1283] dumpGattClientEvent(): GATT Event: Unknown
[V][BLEUtils.cpp:951] gattClientEventTypeToString(): Unknown GATT Client event type: 7
[D][BLEClient.cpp:158] gattClientEventHandler(): gattClientEventHandler [esp_gatt_if: 4] ... Unknown
[V][BLERemoteService.cpp:26] BLERemoteService(): >> BLERemoteService()
[V][BLERemoteService.cpp:34] BLERemoteService(): << BLERemoteService()
[V][BLEUtils.cpp:951] gattClientEventTypeToString(): Unknown GATT Client event type: 7
[D][BLEDevice.cpp:148] gattClientEventHandler(): gattClientEventHandler [esp_gatt_if: 4] ... Unknown
[V][BLEUtils.cpp:951] gattClientEventTypeToString(): Unknown GATT Client event type: 7
[V][BLEUtils.cpp:1283] dumpGattClientEvent(): GATT Event: Unknown
[V][BLEUtils.cpp:951] gattClientEventTypeToString(): Unknown GATT Client event type: 7
[D][BLEClient.cpp:158] gattClientEventHandler(): gattClientEventHandler [esp_gatt_if: 4] ... Unknown
[V][BLERemoteService.cpp:26] BLERemoteService(): >> BLERemoteService()
[V][BLERemoteService.cpp:34] BLERemoteService(): << BLERemoteService()
[V][BLEUtils.cpp:951] gattClientEventTypeToString(): Unknown GATT Client event type: 7
[D][BLEDevice.cpp:148] gattClientEventHandler(): gattClientEventHandler [esp_gatt_if: 4] ... Unknown
[V][BLEUtils.cpp:951] gattClientEventTypeToString(): Unknown GATT Client event type: 7
[V][BLEUtils.cpp:1283] dumpGattClientEvent(): GATT Event: Unknown
[V][BLEUtils.cpp:951] gattClientEventTypeToString(): Unknown GATT Client event type: 7
[D][BLEClient.cpp:158] gattClientEventHandler(): gattClientEventHandler [esp_gatt_if: 4] ... Unknown
[V][BLERemoteService.cpp:26] BLERemoteService(): >> BLERemoteService()
[V][BLERemoteService.cpp:34] BLERemoteService(): << BLERemoteService()
[V][BLEUtils.cpp:951] gattClientEventTypeToString(): Unknown GATT Client event type: 7
[D][BLEDevice.cpp:148] gattClientEventHandler(): gattClientEventHandler [esp_gatt_if: 4] ... Unknown
[V][BLEUtils.cpp:951] gattClientEventTypeToString(): Unknown GATT Client event type: 7
[V][BLEUtils.cpp:1283] dumpGattClientEvent(): GATT Event: Unknown
[V][BLEUtils.cpp:951] gattClientEventTypeToString(): Unknown GATT Client event type: 7
[D][BLEClient.cpp:158] gattClientEventHandler(): gattClientEventHandler [esp_gatt_if: 4] ... Unknown
[V][BLERemoteService.cpp:26] BLERemoteService(): >> BLERemoteService()
[V][BLERemoteService.cpp:34] BLERemoteService(): << BLERemoteService()
[V][BLEUtils.cpp:951] gattClientEventTypeToString(): Unknown GATT Client event type: 7
[D][BLEDevice.cpp:148] gattClientEventHandler(): gattClientEventHandler [esp_gatt_if: 4] ... Unknown
[V][BLEUtils.cpp:951] gattClientEventTypeToString(): Unknown GATT Client event type: 7
[V][BLEUtils.cpp:1283] dumpGattClientEvent(): GATT Event: Unknown
[V][BLEUtils.cpp:951] gattClientEventTypeToString(): Unknown GATT Client event type: 7
[D][BLEClient.cpp:158] gattClientEventHandler(): gattClientEventHandler [esp_gatt_if: 4] ... Unknown
[V][BLERemoteService.cpp:26] BLERemoteService(): >> BLERemoteService()
[V][BLERemoteService.cpp:34] BLERemoteService(): << BLERemoteService()
[V][BLEUtils.cpp:951] gattClientEventTypeToString(): Unknown GATT Client event type: 6
[D][BLEDevice.cpp:148] gattClientEventHandler(): gattClientEventHandler [esp_gatt_if: 4] ... Unknown
[V][BLEUtils.cpp:951] gattClientEventTypeToString(): Unknown GATT Client event type: 6
[V][BLEUtils.cpp:1283] dumpGattClientEvent(): GATT Event: Unknown
[V][BLEUtils.cpp:951] gattClientEventTypeToString(): Unknown GATT Client event type: 6
[D][BLEClient.cpp:158] gattClientEventHandler(): gattClientEventHandler [esp_gatt_if: 4] ... Unknown
[V][FreeRTOS.cpp:143] give(): Semaphore giving: name: SearchCmplEvt (0x3ffdd420), owner: getServices
[V][FreeRTOS.cpp:77] wait(): << wait: Semaphore released: name: SearchCmplEvt (0x3ffdd420), owner: <N/A>
[V][BLEUtils.cpp:951] gattClientEventTypeToString(): Unknown GATT Client event type: 18
[V][BLEClient.cpp:430] getServices(): << getServices
[D][BLEDevice.cpp:148] gattClientEventHandler(): gattClientEventHandler [esp_gatt_if: 4] ... Unknown
[V][BLEClient.cpp:390] getService(): << getService: found the service with uuid: 99fa0020-338a-1024-8a49-009c0215f78a
[V][BLEUtils.cpp:951] gattClientEventTypeToString(): Unknown GATT Client event type: 18
[I][ikea_desk.ino:88] connectToServer(): Found height service
[V][BLEUtils.cpp:1283] dumpGattClientEvent(): GATT Event: Unknown
[V][BLERemoteService.cpp:162] retrieveCharacteristics(): >> getCharacteristics() for service: 99fa0020-338a-1024-8a49-009c0215f78a
[V][BLEUtils.cpp:951] gattClientEventTypeToString(): Unknown GATT Client event type: 18
[D][BLERemoteService.cpp:193] retrieveCharacteristics(): Found a characteristic: Handle: 26, UUID: 99fa0021-338a-1024-8a49-009c0215f78a
[D][BLEClient.cpp:158] gattClientEventHandler(): gattClientEventHandler [esp_gatt_if: 4] ... Unknown
[V][BLERemoteCharacteristic.cpp:36] BLERemoteCharacteristic(): >> BLERemoteCharacteristic: handle: 26 0x26, uuid: 99fa0021-338a-1024-8a49-009c0215f78a
[V][BLERemoteCharacteristic.cpp:250] retrieveDescriptors(): >> retrieveDescriptors() for characteristic: 99fa0021-338a-1024-8a49-009c0215f78a
[D][BLERemoteCharacteristic.cpp:280] retrieveDescriptors(): Found a descriptor: Handle: 27, UUID: 00002902-0000-1000-8000-00805f9b34fb
[V][BLERemoteCharacteristic.cpp:294] retrieveDescriptors(): << retrieveDescriptors(): Found 1 descriptors.
[V][BLERemoteCharacteristic.cpp:45] BLERemoteCharacteristic(): << BLERemoteCharacteristic
[D][BLERemoteService.cpp:193] retrieveCharacteristics(): Found a characteristic: Handle: 29, UUID: 99fa0029-338a-1024-8a49-009c0215f78a
[V][BLERemoteCharacteristic.cpp:36] BLERemoteCharacteristic(): >> BLERemoteCharacteristic: handle: 29 0x29, uuid: 99fa0029-338a-1024-8a49-009c0215f78a
[V][BLERemoteCharacteristic.cpp:250] retrieveDescriptors(): >> retrieveDescriptors() for characteristic: 99fa0029-338a-1024-8a49-009c0215f78a
[E][BLERemoteCharacteristic.cpp:274] retrieveDescriptors(): esp_ble_gattc_get_all_descr: Unknown
[V][BLERemoteCharacteristic.cpp:294] retrieveDescriptors(): << retrieveDescriptors(): Found 0 descriptors.
[V][BLERemoteCharacteristic.cpp:45] BLERemoteCharacteristic(): << BLERemoteCharacteristic
[D][BLERemoteService.cpp:193] retrieveCharacteristics(): Found a characteristic: Handle: 31, UUID: 99fa002a-338a-1024-8a49-009c0215f78a
[V][BLERemoteCharacteristic.cpp:36] BLERemoteCharacteristic(): >> BLERemoteCharacteristic: handle: 31 0x31, uuid: 99fa002a-338a-1024-8a49-009c0215f78a
[V][BLERemoteCharacteristic.cpp:250] retrieveDescriptors(): >> retrieveDescriptors() for characteristic: 99fa002a-338a-1024-8a49-009c0215f78a
[E][BLERemoteCharacteristic.cpp:274] retrieveDescriptors(): esp_ble_gattc_get_all_descr: Unknown
[V][BLERemoteCharacteristic.cpp:294] retrieveDescriptors(): << retrieveDescriptors(): Found 0 descriptors.
[V][BLERemoteCharacteristic.cpp:45] BLERemoteCharacteristic(): << BLERemoteCharacteristic
[V][BLERemoteService.cpp:209] retrieveCharacteristics(): << getCharacteristics()
[I][ikea_desk.ino:99] connectToServer(): Found height characteristic
[I][ikea_desk.ino:102] connectToServer(): Set height characteristic notify
[V][BLERemoteCharacteristic.cpp:438] registerForNotify(): >> registerForNotify(): Characteristic: uuid: 99fa0021-338a-1024-8a49-009c0215f78a, handle: 26 0x001a, props: broadcast: 0, read: 1, write_nr: 0, write: 0, notify: 1, indicate: 0, auth: 0
[D][FreeRTOS.cpp:189] take(): Semaphore taking: name: RegForNotifyEvt (0x3ffdfa24), owner: <N/A> for registerForNotify
[D][FreeRTOS.cpp:198] take(): Semaphore taken:  name: RegForNotifyEvt (0x3ffdfa24), owner: registerForNotify
[V][BLERemoteCharacteristic.cpp:323] getDescriptor(): >> getDescriptor: uuid: 00002902-0000-1000-8000-00805f9b34fb
[V][BLEUtils.cpp:951] gattClientEventTypeToString(): Unknown GATT Client event type: 38
[V][BLERemoteCharacteristic.cpp:327] getDescriptor(): << getDescriptor: found
[D][BLEDevice.cpp:148] gattClientEventHandler(): gattClientEventHandler [esp_gatt_if: 4] ... Unknown
[V][BLERemoteDescriptor.cpp:132] writeValue(): >> writeValue: handle: 27, uuid: 00002902-0000-1000-8000-00805f9b34fb
[V][BLEUtils.cpp:951] gattClientEventTypeToString(): Unknown GATT Client event type: 38
[V][BLERemoteDescriptor.cpp:151] writeValue(): << writeValue
[V][BLEUtils.cpp:1283] dumpGattClientEvent(): GATT Event: Unknown
[V][FreeRTOS.cpp:63] wait(): >> wait: Semaphore waiting: name: RegForNotifyEvt (0x3ffdfa24), owner: registerForNotify for registerForNotify
[V][BLEUtils.cpp:951] gattClientEventTypeToString(): Unknown GATT Client event type: 38
[D][BLEClient.cpp:158] gattClientEventHandler(): gattClientEventHandler [esp_gatt_if: 4] ... Unknown
[V][FreeRTOS.cpp:143] give(): Semaphore giving: name: RegForNotifyEvt (0x3ffdfa24), owner: registerForNotify
[V][FreeRTOS.cpp:77] wait(): << wait: Semaphore released: name: RegForNotifyEvt (0x3ffdfa24), owner: <N/A>
[V][BLEUtils.cpp:951] gattClientEventTypeToString(): Unknown GATT Client event type: 9
[V][BLERemoteCharacteristic.cpp:478] registerForNotify(): << registerForNotify()
[I][ikea_desk.ino:107] connectToServer(): Can read Height
[D][BLEDevice.cpp:148] gattClientEventHandler(): gattClientEventHandler [esp_gatt_if: 4] ... Unknown
[V][BLERemoteCharacteristic.cpp:398] readValue(): >> readValue(): uuid: 99fa0021-338a-1024-8a49-009c0215f78a, handle: 26 0x1a
[V][BLEUtils.cpp:951] gattClientEventTypeToString(): Unknown GATT Client event type: 9
[D][FreeRTOS.cpp:189] take(): Semaphore taking: name: ReadCharEvt (0x3ffdf9c4), owner: <N/A> for readValue
[V][BLEUtils.cpp:1283] dumpGattClientEvent(): GATT Event: Unknown
[D][FreeRTOS.cpp:198] take(): Semaphore taken:  name: ReadCharEvt (0x3ffdf9c4), owner: readValue
[V][BLEUtils.cpp:951] gattClientEventTypeToString(): Unknown GATT Client event type: 9
[V][FreeRTOS.cpp:63] wait(): >> wait: Semaphore waiting: name: ReadCharEvt (0x3ffdf9c4), owner: readValue for readValue
[D][BLEClient.cpp:158] gattClientEventHandler(): gattClientEventHandler [esp_gatt_if: 4] ... Unknown
[V][BLEUtils.cpp:1817] gapEventToString(): gapEventToString: Unknown event type 8 0x08
[V][BLEUtils.cpp:1049] dumpGapEvent(): Received a GAP event: Unknown event type
[V][BLEUtils.cpp:1264] dumpGapEvent(): *** dumpGapEvent: Logger not coded ***
[I][BLEDevice.cpp:253] gapEventHandler(): ESP_GAP_BLE_AUTH_CMPL_EVT
[D][BLEClient.cpp:458] handleGAPEvent(): BLEClient ... handling GAP event!
[V][BLEUtils.cpp:951] gattClientEventTypeToString(): Unknown GATT Client event type: 3
[D][BLEDevice.cpp:148] gattClientEventHandler(): gattClientEventHandler [esp_gatt_if: 4] ... Unknown
[V][BLEUtils.cpp:951] gattClientEventTypeToString(): Unknown GATT Client event type: 3
[V][BLEUtils.cpp:1283] dumpGattClientEvent(): GATT Event: Unknown
[V][BLEUtils.cpp:951] gattClientEventTypeToString(): Unknown GATT Client event type: 3
[D][BLEClient.cpp:158] gattClientEventHandler(): gattClientEventHandler [esp_gatt_if: 4] ... Unknown
[V][FreeRTOS.cpp:143] give(): Semaphore giving: name: ReadCharEvt (0x3ffdf9c4), owner: readValue
[V][FreeRTOS.cpp:77] wait(): << wait: Semaphore released: name: ReadCharEvt (0x3ffdf9c4), owner: <N/A>
[V][BLERemoteCharacteristic.cpp:426] readValue(): << readValue(): length: 4, content: �
[D][ikea_desk.ino:55] readHeight(): Height: 1439, Speed: 0
Setting new characteristic value to "Time since boot: 3"
[V][BLEUtils.cpp:1817] gapEventToString(): gapEventToString: Unknown event type 20 0x14
[V][BLEUtils.cpp:1049] dumpGapEvent(): Received a GAP event: Unknown event type
[V][BLEUtils.cpp:1264] dumpGapEvent(): *** dumpGapEvent: Logger not coded ***
[D][BLEClient.cpp:458] handleGAPEvent(): BLEClient ... handling GAP event!

But sometime it cannot, with the log of

Code: Select all

[I][ikea_desk.ino:126] setup(): Starting Arduino BLE Client application...
[I][ikea_desk.ino:70] connectToServer(): Forming a connection to e2:70:5c:5b:d3:26
[V][BLEDevice.cpp:60] createClient(): >> createClient
[V][BLEDevice.cpp:66] createClient(): << createClient
[I][ikea_desk.ino:73] connectToServer(): Created client
[V][BLEClient.cpp:96] connect(): >> connect(e2:70:5c:5b:d3:26)
[I][BLEDevice.cpp:593] addPeerDevice(): add conn_id: 0, GATT role: client
[D][FreeRTOS.cpp:189] take(): Semaphore taking: name: RegEvt (0x3ffdd16c), owner: <N/A> for connect
[D][FreeRTOS.cpp:198] take(): Semaphore taken:  name: RegEvt (0x3ffdd16c), owner: connect
[V][FreeRTOS.cpp:63] wait(): >> wait: Semaphore waiting: name: RegEvt (0x3ffdd16c), owner: connect for connect
[V][BLEUtils.cpp:951] gattClientEventTypeToString(): Unknown GATT Client event type: 0
[D][BLEDevice.cpp:148] gattClientEventHandler(): gattClientEventHandler [esp_gatt_if: 4] ... Unknown
[V][BLEUtils.cpp:951] gattClientEventTypeToString(): Unknown GATT Client event type: 0
[V][BLEUtils.cpp:1283] dumpGattClientEvent(): GATT Event: Unknown
[V][BLEUtils.cpp:951] gattClientEventTypeToString(): Unknown GATT Client event type: 0
[D][BLEClient.cpp:158] gattClientEventHandler(): gattClientEventHandler [esp_gatt_if: 4] ... Unknown
[V][FreeRTOS.cpp:143] give(): Semaphore giving: name: RegEvt (0x3ffdd16c), owner: connect
[V][FreeRTOS.cpp:77] wait(): << wait: Semaphore released: name: RegEvt (0x3ffdd16c), owner: <N/A>
[D][FreeRTOS.cpp:189] take(): Semaphore taking: name: OpenEvt (0x3ffdd3c0), owner: <N/A> for connect
[D][FreeRTOS.cpp:198] take(): Semaphore taken:  name: OpenEvt (0x3ffdd3c0), owner: connect
[V][FreeRTOS.cpp:63] wait(): >> wait: Semaphore waiting: name: OpenEvt (0x3ffdd3c0), owner: connect for connect
[V][BLEUtils.cpp:951] gattClientEventTypeToString(): Unknown GATT Client event type: 40
[D][BLEDevice.cpp:148] gattClientEventHandler(): gattClientEventHandler [esp_gatt_if: 4] ... Unknown
[V][BLEUtils.cpp:951] gattClientEventTypeToString(): Unknown GATT Client event type: 40
[V][BLEUtils.cpp:1283] dumpGattClientEvent(): GATT Event: Unknown
[V][BLEUtils.cpp:951] gattClientEventTypeToString(): Unknown GATT Client event type: 40
[D][BLEClient.cpp:158] gattClientEventHandler(): gattClientEventHandler [esp_gatt_if: 4] ... Unknown
[D][BLEDevice.cpp:577] updatePeerDevice(): update conn_id: 4, GATT role: client
[V][BLEUtils.cpp:951] gattClientEventTypeToString(): Unknown GATT Client event type: 2
[D][BLEDevice.cpp:148] gattClientEventHandler(): gattClientEventHandler [esp_gatt_if: 4] ... Unknown
[V][BLEUtils.cpp:951] gattClientEventTypeToString(): Unknown GATT Client event type: 2
[V][BLEUtils.cpp:1283] dumpGattClientEvent(): GATT Event: Unknown
[V][BLEUtils.cpp:951] gattClientEventTypeToString(): Unknown GATT Client event type: 2
[D][BLEClient.cpp:158] gattClientEventHandler(): gattClientEventHandler [esp_gatt_if: 4] ... Unknown
[V][FreeRTOS.cpp:143] give(): Semaphore giving: name: OpenEvt (0x3ffdd3c0), owner: connect
[V][FreeRTOS.cpp:77] wait(): << wait: Semaphore released: name: OpenEvt (0x3ffdd3c0), owner: <N/A>
[V][BLEClient.cpp:129] connect(): << connect(), rc=1
[I][ikea_desk.ino:78] connectToServer(): Connected to server
[V][BLEClient.cpp:377] getService(): >> getService: uuid: 99fa0020-338a-1024-8a49-009c0215f78a
[V][BLEClient.cpp:413] getServices(): >> getServices
[V][BLEClient.cpp:71] clearServices(): >> clearServices
[V][BLEClient.cpp:78] clearServices(): << clearServices
[D][FreeRTOS.cpp:189] take(): Semaphore taking: name: SearchCmplEvt (0x3ffdd420), owner: <N/A> for getServices
[D][FreeRTOS.cpp:198] take(): Semaphore taken:  name: SearchCmplEvt (0x3ffdd420), owner: getServices
[V][FreeRTOS.cpp:63] wait(): >> wait: Semaphore waiting: name: SearchCmplEvt (0x3ffdd420), owner: getServices for getServices
[V][BLEUtils.cpp:951] gattClientEventTypeToString(): Unknown GATT Client event type: 7
[D][BLEDevice.cpp:148] gattClientEventHandler(): gattClientEventHandler [esp_gatt_if: 4] ... Unknown
[V][BLEUtils.cpp:951] gattClientEventTypeToString(): Unknown GATT Client event type: 7
[V][BLEUtils.cpp:1283] dumpGattClientEvent(): GATT Event: Unknown
[V][BLEUtils.cpp:951] gattClientEventTypeToString(): Unknown GATT Client event type: 7
[D][BLEClient.cpp:158] gattClientEventHandler(): gattClientEventHandler [esp_gatt_if: 4] ... Unknown
[V][BLERemoteService.cpp:26] BLERemoteService(): >> BLERemoteService()
[V][BLERemoteService.cpp:34] BLERemoteService(): << BLERemoteService()
[V][BLEUtils.cpp:951] gattClientEventTypeToString(): Unknown GATT Client event type: 7
[D][BLEDevice.cpp:148] gattClientEventHandler(): gattClientEventHandler [esp_gatt_if: 4] ... Unknown
[V][BLEUtils.cpp:951] gattClientEventTypeToString(): Unknown GATT Client event type: 7
[V][BLEUtils.cpp:1283] dumpGattClientEvent(): GATT Event: Unknown
[V][BLEUtils.cpp:951] gattClientEventTypeToString(): Unknown GATT Client event type: 7
[D][BLEClient.cpp:158] gattClientEventHandler(): gattClientEventHandler [esp_gatt_if: 4] ... Unknown
[V][BLERemoteService.cpp:26] BLERemoteService(): >> BLERemoteService()
[V][BLERemoteService.cpp:34] BLERemoteService(): << BLERemoteService()
[V][BLEUtils.cpp:951] gattClientEventTypeToString(): Unknown GATT Client event type: 7
[D][BLEDevice.cpp:148] gattClientEventHandler(): gattClientEventHandler [esp_gatt_if: 4] ... Unknown
[V][BLEUtils.cpp:951] gattClientEventTypeToString(): Unknown GATT Client event type: 7
[V][BLEUtils.cpp:1283] dumpGattClientEvent(): GATT Event: Unknown
[V][BLEUtils.cpp:951] gattClientEventTypeToString(): Unknown GATT Client event type: 7
[D][BLEClient.cpp:158] gattClientEventHandler(): gattClientEventHandler [esp_gatt_if: 4] ... Unknown
[V][BLERemoteService.cpp:26] BLERemoteService(): >> BLERemoteService()
[V][BLERemoteService.cpp:34] BLERemoteService(): << BLERemoteService()
[V][BLEUtils.cpp:951] gattClientEventTypeToString(): Unknown GATT Client event type: 7
[D][BLEDevice.cpp:148] gattClientEventHandler(): gattClientEventHandler [esp_gatt_if: 4] ... Unknown
[V][BLEUtils.cpp:951] gattClientEventTypeToString(): Unknown GATT Client event type: 7
[V][BLEUtils.cpp:1283] dumpGattClientEvent(): GATT Event: Unknown
[V][BLEUtils.cpp:951] gattClientEventTypeToString(): Unknown GATT Client event type: 7
[D][BLEClient.cpp:158] gattClientEventHandler(): gattClientEventHandler [esp_gatt_if: 4] ... Unknown
[V][BLERemoteService.cpp:26] BLERemoteService(): >> BLERemoteService()
[V][BLERemoteService.cpp:34] BLERemoteService(): << BLERemoteService()
[V][BLEUtils.cpp:951] gattClientEventTypeToString(): Unknown GATT Client event type: 7
[D][BLEDevice.cpp:148] gattClientEventHandler(): gattClientEventHandler [esp_gatt_if: 4] ... Unknown
[V][BLEUtils.cpp:951] gattClientEventTypeToString(): Unknown GATT Client event type: 7
[V][BLEUtils.cpp:1283] dumpGattClientEvent(): GATT Event: Unknown
[V][BLEUtils.cpp:951] gattClientEventTypeToString(): Unknown GATT Client event type: 7
[D][BLEClient.cpp:158] gattClientEventHandler(): gattClientEventHandler [esp_gatt_if: 4] ... Unknown
[V][BLERemoteService.cpp:26] BLERemoteService(): >> BLERemoteService()
[V][BLERemoteService.cpp:34] BLERemoteService(): << BLERemoteService()
[V][BLEUtils.cpp:951] gattClientEventTypeToString(): Unknown GATT Client event type: 7
[D][BLEDevice.cpp:148] gattClientEventHandler(): gattClientEventHandler [esp_gatt_if: 4] ... Unknown
[V][BLEUtils.cpp:951] gattClientEventTypeToString(): Unknown GATT Client event type: 7
[V][BLEUtils.cpp:1283] dumpGattClientEvent(): GATT Event: Unknown
[V][BLEUtils.cpp:951] gattClientEventTypeToString(): Unknown GATT Client event type: 7
[D][BLEClient.cpp:158] gattClientEventHandler(): gattClientEventHandler [esp_gatt_if: 4] ... Unknown
[V][BLERemoteService.cpp:26] BLERemoteService(): >> BLERemoteService()
[V][BLERemoteService.cpp:34] BLERemoteService(): << BLERemoteService()
[V][BLEUtils.cpp:951] gattClientEventTypeToString(): Unknown GATT Client event type: 6
[D][BLEDevice.cpp:148] gattClientEventHandler(): gattClientEventHandler [esp_gatt_if: 4] ... Unknown
[V][BLEUtils.cpp:951] gattClientEventTypeToString(): Unknown GATT Client event type: 6
[V][BLEUtils.cpp:1283] dumpGattClientEvent(): GATT Event: Unknown
[V][BLEUtils.cpp:951] gattClientEventTypeToString(): Unknown GATT Client event type: 6
[D][BLEClient.cpp:158] gattClientEventHandler(): gattClientEventHandler [esp_gatt_if: 4] ... Unknown
[V][FreeRTOS.cpp:143] give(): Semaphore giving: name: SearchCmplEvt (0x3ffdd420), owner: getServices
[V][FreeRTOS.cpp:77] wait(): << wait: Semaphore released: name: SearchCmplEvt (0x3ffdd420), owner: <N/A>
[V][BLEUtils.cpp:951] gattClientEventTypeToString(): Unknown GATT Client event type: 18
[V][BLEClient.cpp:430] getServices(): << getServices
[D][BLEDevice.cpp:148] gattClientEventHandler(): gattClientEventHandler [esp_gatt_if: 4] ... Unknown
[V][BLEClient.cpp:390] getService(): << getService: found the service with uuid: 99fa0020-338a-1024-8a49-009c0215f78a
[V][BLEUtils.cpp:951] gattClientEventTypeToString(): Unknown GATT Client event type: 18
[I][ikea_desk.ino:88] connectToServer(): Found height service
[V][BLEUtils.cpp:1283] dumpGattClientEvent(): GATT Event: Unknown
[V][BLERemoteService.cpp:162] retrieveCharacteristics(): >> getCharacteristics() for service: 99fa0020-338a-1024-8a49-009c0215f78a
[V][BLEUtils.cpp:951] gattClientEventTypeToString(): Unknown GATT Client event type: 18
[D][BLERemoteService.cpp:193] retrieveCharacteristics(): Found a characteristic: Handle: 26, UUID: 99fa0021-338a-1024-8a49-009c0215f78a
[D][BLEClient.cpp:158] gattClientEventHandler(): gattClientEventHandler [esp_gatt_if: 4] ... Unknown
[V][BLERemoteCharacteristic.cpp:36] BLERemoteCharacteristic(): >> BLERemoteCharacteristic: handle: 26 0x26, uuid: 99fa0021-338a-1024-8a49-009c0215f78a
[V][BLERemoteCharacteristic.cpp:250] retrieveDescriptors(): >> retrieveDescriptors() for characteristic: 99fa0021-338a-1024-8a49-009c0215f78a
[D][BLERemoteCharacteristic.cpp:280] retrieveDescriptors(): Found a descriptor: Handle: 27, UUID: 00002902-0000-1000-8000-00805f9b34fb
[V][BLERemoteCharacteristic.cpp:294] retrieveDescriptors(): << retrieveDescriptors(): Found 1 descriptors.
[V][BLERemoteCharacteristic.cpp:45] BLERemoteCharacteristic(): << BLERemoteCharacteristic
[D][BLERemoteService.cpp:193] retrieveCharacteristics(): Found a characteristic: Handle: 29, UUID: 99fa0029-338a-1024-8a49-009c0215f78a
[V][BLERemoteCharacteristic.cpp:36] BLERemoteCharacteristic(): >> BLERemoteCharacteristic: handle: 29 0x29, uuid: 99fa0029-338a-1024-8a49-009c0215f78a
[V][BLERemoteCharacteristic.cpp:250] retrieveDescriptors(): >> retrieveDescriptors() for characteristic: 99fa0029-338a-1024-8a49-009c0215f78a
[E][BLERemoteCharacteristic.cpp:274] retrieveDescriptors(): esp_ble_gattc_get_all_descr: Unknown
[V][BLERemoteCharacteristic.cpp:294] retrieveDescriptors(): << retrieveDescriptors(): Found 0 descriptors.
[V][BLERemoteCharacteristic.cpp:45] BLERemoteCharacteristic(): << BLERemoteCharacteristic
[D][BLERemoteService.cpp:193] retrieveCharacteristics(): Found a characteristic: Handle: 31, UUID: 99fa002a-338a-1024-8a49-009c0215f78a
[V][BLERemoteCharacteristic.cpp:36] BLERemoteCharacteristic(): >> BLERemoteCharacteristic: handle: 31 0x31, uuid: 99fa002a-338a-1024-8a49-009c0215f78a
[V][BLERemoteCharacteristic.cpp:250] retrieveDescriptors(): >> retrieveDescriptors() for characteristic: 99fa002a-338a-1024-8a49-009c0215f78a
[E][BLERemoteCharacteristic.cpp:274] retrieveDescriptors(): esp_ble_gattc_get_all_descr: Unknown
[V][BLERemoteCharacteristic.cpp:294] retrieveDescriptors(): << retrieveDescriptors(): Found 0 descriptors.
[V][BLERemoteCharacteristic.cpp:45] BLERemoteCharacteristic(): << BLERemoteCharacteristic
[V][BLERemoteService.cpp:209] retrieveCharacteristics(): << getCharacteristics()
[I][ikea_desk.ino:99] connectToServer(): Found height characteristic
[I][ikea_desk.ino:102] connectToServer(): Set height characteristic notify
[V][BLERemoteCharacteristic.cpp:438] registerForNotify(): >> registerForNotify(): Characteristic: uuid: 99fa0021-338a-1024-8a49-009c0215f78a, handle: 26 0x001a, props: broadcast: 0, read: 1, write_nr: 0, write: 0, notify: 1, indicate: 0, auth: 0
[D][FreeRTOS.cpp:189] take(): Semaphore taking: name: RegForNotifyEvt (0x3ffdfa24), owner: <N/A> for registerForNotify
[D][FreeRTOS.cpp:198] take(): Semaphore taken:  name: RegForNotifyEvt (0x3ffdfa24), owner: registerForNotify
[V][BLERemoteCharacteristic.cpp:323] getDescriptor(): >> getDescriptor: uuid: 00002902-0000-1000-8000-00805f9b34fb
[V][BLEUtils.cpp:951] gattClientEventTypeToString(): Unknown GATT Client event type: 38
[V][BLERemoteCharacteristic.cpp:327] getDescriptor(): << getDescriptor: found
[D][BLEDevice.cpp:148] gattClientEventHandler(): gattClientEventHandler [esp_gatt_if: 4] ... Unknown
[V][BLERemoteDescriptor.cpp:132] writeValue(): >> writeValue: handle: 27, uuid: 00002902-0000-1000-8000-00805f9b34fb
[V][BLEUtils.cpp:951] gattClientEventTypeToString(): Unknown GATT Client event type: 38
[V][BLERemoteDescriptor.cpp:151] writeValue(): << writeValue
[V][BLEUtils.cpp:1283] dumpGattClientEvent(): GATT Event: Unknown
[V][FreeRTOS.cpp:63] wait(): >> wait: Semaphore waiting: name: RegForNotifyEvt (0x3ffdfa24), owner: registerForNotify for registerForNotify
[V][BLEUtils.cpp:951] gattClientEventTypeToString(): Unknown GATT Client event type: 38
[D][BLEClient.cpp:158] gattClientEventHandler(): gattClientEventHandler [esp_gatt_if: 4] ... Unknown
[V][FreeRTOS.cpp:143] give(): Semaphore giving: name: RegForNotifyEvt (0x3ffdfa24), owner: registerForNotify
[V][FreeRTOS.cpp:77] wait(): << wait: Semaphore released: name: RegForNotifyEvt (0x3ffdfa24), owner: <N/A>
[V][BLEUtils.cpp:951] gattClientEventTypeToString(): Unknown GATT Client event type: 9
[V][BLERemoteCharacteristic.cpp:478] registerForNotify(): << registerForNotify()
[I][ikea_desk.ino:107] connectToServer(): Can read Height
[D][BLEDevice.cpp:148] gattClientEventHandler(): gattClientEventHandler [esp_gatt_if: 4] ... Unknown
[V][BLERemoteCharacteristic.cpp:398] readValue(): >> readValue(): uuid: 99fa0021-338a-1024-8a49-009c0215f78a, handle: 26 0x1a
[V][BLEUtils.cpp:951] gattClientEventTypeToString(): Unknown GATT Client event type: 9
[D][FreeRTOS.cpp:189] take(): Semaphore taking: name: ReadCharEvt (0x3ffdf9c4), owner: <N/A> for readValue
[V][BLEUtils.cpp:1283] dumpGattClientEvent(): GATT Event: Unknown
[D][FreeRTOS.cpp:198] take(): Semaphore taken:  name: ReadCharEvt (0x3ffdf9c4), owner: readValue
[V][BLEUtils.cpp:951] gattClientEventTypeToString(): Unknown GATT Client event type: 9
[V][FreeRTOS.cpp:63] wait(): >> wait: Semaphore waiting: name: ReadCharEvt (0x3ffdf9c4), owner: readValue for readValue
[D][BLEClient.cpp:158] gattClientEventHandler(): gattClientEventHandler [esp_gatt_if: 4] ... Unknown
[V][BLEUtils.cpp:951] gattClientEventTypeToString(): Unknown GATT Client event type: 3
[D][BLEDevice.cpp:148] gattClientEventHandler(): gattClientEventHandler [esp_gatt_if: 4] ... Unknown
[V][BLEUtils.cpp:951] gattClientEventTypeToString(): Unknown GATT Client event type: 3
[V][BLEUtils.cpp:1283] dumpGattClientEvent(): GATT Event: Unknown
[V][BLEUtils.cpp:951] gattClientEventTypeToString(): Unknown GATT Client event type: 3
[D][BLEClient.cpp:158] gattClientEventHandler(): gattClientEventHandler [esp_gatt_if: 4] ... Unknown
[V][FreeRTOS.cpp:143] give(): Semaphore giving: name: ReadCharEvt (0x3ffdf9c4), owner: readValue
[V][FreeRTOS.cpp:77] wait(): << wait: Semaphore released: name: ReadCharEvt (0x3ffdf9c4), owner: <N/A>
[V][BLERemoteCharacteristic.cpp:426] readValue(): << readValue(): length: 0, content: 
[D][ikea_desk.ino:55] readHeight(): Height: 0, Speed: 0
Setting new characteristic value to "Time since boot: 2"
[V][BLEUtils.cpp:1817] gapEventToString(): gapEventToString: Unknown event type 8 0x08
[V][BLEUtils.cpp:1049] dumpGapEvent(): Received a GAP event: Unknown event type
[V][BLEUtils.cpp:1264] dumpGapEvent(): *** dumpGapEvent: Logger not coded ***
[I][BLEDevice.cpp:253] gapEventHandler(): ESP_GAP_BLE_AUTH_CMPL_EVT
[D][BLEClient.cpp:458] handleGAPEvent(): BLEClient ... handling GAP event!
[V][BLEUtils.cpp:1817] gapEventToString(): gapEventToString: Unknown event type 20 0x14
[V][BLEUtils.cpp:1049] dumpGapEvent(): Received a GAP event: Unknown event type
[V][BLEUtils.cpp:1264] dumpGapEvent(): *** dumpGapEvent: Logger not coded ***
[D][BLEClient.cpp:458] handleGAPEvent(): BLEClient ... handling GAP event!
Also if I call `readValue()` twice in a sequence, the second call seems to be able to get the data reliably.

I don't think there is something wrong with the BLE server, It has been tested on a computer and a phone.

Any help will be appreciated.
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chegewara
Posts: 2364
Joined: Wed Jun 14, 2017 9:00 pm

Re: BLE characteristic readValue cannot reliably read data

Postby chegewara » Fri Aug 21, 2020 3:48 am

This is the reason:

Code: Select all

[I][BLEDevice.cpp:253] gapEventHandler(): ESP_GAP_BLE_AUTH_CMPL_EVT
Please compare both logs. In short, you cant read from ble server until authentication is not completed with success.
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lightingghost
Posts: 3
Joined: Thu Aug 20, 2020 8:28 pm

Re: BLE characteristic readValue cannot reliably read data

Postby lightingghost » Fri Aug 21, 2020 5:28 am

Thank you for pointing it out.

It seems to me that this authentication process happens inside readValue(), is it possible for me to wait for authentication?

Sorry for the noob question, but I am following the examples provided and cannot find a place to control the authentication.
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chegewara
Posts: 2364
Joined: Wed Jun 14, 2017 9:00 pm

Re: BLE characteristic readValue cannot reliably read data

Postby chegewara » Mon Aug 24, 2020 5:20 am

https://github.com/nkolban/esp32-snippe ... ey.cpp#L48
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