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BleError: Characteristic X notify change failed for device Y and service Z - monitoring ESP32 Arduino device peripheral on iOS

See original GitHub issue

Prerequisites

  • I am running the latest version
  • I checked the documentation and found no answer
  • I checked to make sure that this issue has not already been filed. I’ve read some similar issues that say that issue has been solved on version 1.0.2, but seems to haven’t been solved.

https://github.com/Polidea/react-native-ble-plx/issues/229 https://github.com/Polidea/react-native-ble-plx/issues/264 https://github.com/Polidea/RxAndroidBle/issues/202

Expected Behavior

subscribe to service’s characteristic via characteristic.monitor() method and receive values broadcasted by the peripheral device when callback function is executed

Current Behavior

subscribe to service’s characteristic via characteristic.monitor() method and receive the following error when callback function is executed

BleError: Characteristic d8b2c95b-b317-47ca-ac02-ccfd3d85a666 notify change failed for device 80293EA3-F380-A86F-B84F-DFC1A5B23502 and service ef66ccad-f4a8-4c51-b025-bc2a2c9fdaa6

Steps to Reproduce

  1. Connect to device
        device.connect()
          .then((device) => {
            this.setInfo("Discovering services and characteristics")
            return device.discoverAllServicesAndCharacteristics()
          })
          .then((device) => {
            this.setInfo("Setting notifications")
            return this.setupNotifications(device)
          })
          .then(() => {
            this.setInfo("Listening...")
          }, (error) => {
            this.setError(error.message)
          })
  1. Access the characteristic and monitor it
     let voltageCharacteristic = null

      snifferService = services.filter(service => service.uuid === SERVICE_SNIFFER_UUID)[0]

      snifferService.characteristics()
        .then(characteristics => {
          voltageCharacteristic = characteristics.filter(c => c.uuid === SNIFFER_VOLTAGE_UUID)[0]
          voltageCharacteristic.read().then(res => {
            voltageCharacteristic.monitor((error, c) => {
              // getting the error here (voltageCharacteristic has notifiable attribute set to true)
            })
          })
        })
        .catch(error => console.log(error))

Context

BLE Peripheral Device: ESP32 DEVKIT v1

  • Library version: 1.0.3
  • Platform: iOS.
  • Platform logs (logcat/Xcode):
[RxBLEKit|DEBG|14:09:35.624]: CentralManager(10861909952) cancelPeripheralConnection(peripheral: Peripheral(uuid: 80293EA3-F380-A86F-B84F-DFC1A5B23502, name: Optional("XFit")))
[RxBLEKit|DEBG|14:09:35.632]: CentralManager(10861909952) cancelPeripheralConnection(peripheral: Peripheral(uuid: 80293EA3-F380-A86F-B84F-DFC1A5B23502, name: Optional("XFit")))
[RxBLEKit|DEBG|14:09:35.632]: CentralManager(10861909952) didDisconnect(from: Peripheral(uuid: 80293EA3-F380-A86F-B84F-DFC1A5B23502, name: Optional("XFit")), error: nil)
2019-05-22 16:09:35.642708+0200 crossfitApp[3330:989980] [CoreBluetooth] XPC connection invalid
2019-05-22 16:09:36.933669+0200 crossfitApp[3330:989975] [CoreBluetooth] API MISUSE: <CBCentralManager: 0x28766e540> has no restore identifier but the delegate implements the centralManager:willRestoreState: method. Restoring will not be supported
[RxBLEKit|DEBG|14:09:36.947]: CentralManager(10861602112) didUpdateState(state: poweredOn)
[RxBLEKit|DEBG|14:09:36.957]: CentralManager(10861602112) scanForPeripherals(withServices: nil, options: Optional([:]))
[RxBLEKit|VERB|14:09:36.971]: CentralManager(10861602112) didDiscover(peripheral: Peripheral(uuid: C020115B-51E7-2C81-51CB-DF1BC55A697F, name: nil), rssi: -70)
[RxBLEKit|VERB|14:09:36.973]: CentralManager(10861602112) didDiscover(peripheral: Peripheral(uuid: 34673AF0-4EA0-8710-4214-988B5CDBF059, name: nil), rssi: -93)
[RxBLEKit|VERB|14:09:36.978]: CentralManager(10861602112) didDiscover(peripheral: Peripheral(uuid: B403A3C1-C3BC-526B-0B29-7B84DA12898A, name: nil), rssi: -79)
[RxBLEKit|VERB|14:09:36.984]: CentralManager(10861602112) didDiscover(peripheral: Peripheral(uuid: 0F6DBCFA-4C35-A4ED-665F-35420F685B35, name: nil), rssi: -99)
[RxBLEKit|VERB|14:09:36.985]: CentralManager(10861602112) didDiscover(peripheral: Peripheral(uuid: 2506CBEC-6659-1F85-103F-D51372463A4F, name: nil), rssi: -67)
[RxBLEKit|VERB|14:09:36.999]: CentralManager(10861602112) didDiscover(peripheral: Peripheral(uuid: FABCBC8B-B340-96AA-BB1A-2A61E868B20F, name: nil), rssi: -78)
[RxBLEKit|VERB|14:09:36.999]: CentralManager(10861602112) didDiscover(peripheral: Peripheral(uuid: 0F5E6A85-8F12-B3CE-3E20-429CB6ABB9FA, name: nil), rssi: 127)
[RxBLEKit|VERB|14:09:37.000]: CentralManager(10861602112) didDiscover(peripheral: Peripheral(uuid: 716D9F46-139A-D8D9-39A7-D430CC044FBE, name: nil), rssi: -73)
[RxBLEKit|VERB|14:09:37.002]: CentralManager(10861602112) didDiscover(peripheral: Peripheral(uuid: EFA0E1FB-E4C7-E927-F0D0-D1CDF87745CA, name: nil), rssi: -89)
[RxBLEKit|VERB|14:09:37.004]: CentralManager(10861602112) didDiscover(peripheral: Peripheral(uuid: 8D27405F-DF76-EF35-75F6-00AED3E73C0C, name: nil), rssi: -83)
[RxBLEKit|VERB|14:09:37.015]: CentralManager(10861602112) didDiscover(peripheral: Peripheral(uuid: E2D11F25-979C-F401-5E15-02FC79BDF5DF, name: nil), rssi: 127)
[RxBLEKit|VERB|14:09:37.019]: CentralManager(10861602112) didDiscover(peripheral: Peripheral(uuid: 1E37C315-3529-B921-AFA5-8089BFD1745C, name: nil), rssi: -81)
[RxBLEKit|VERB|14:09:37.028]: CentralManager(10861602112) didDiscover(peripheral: Peripheral(uuid: 0A5DAD63-78FA-4CD9-C13A-A73A49BFA322, name: nil), rssi: -88)
[RxBLEKit|VERB|14:09:37.032]: CentralManager(10861602112) didDiscover(peripheral: Peripheral(uuid: 6D504379-83E6-73AC-4F82-6CA641FA340A, name: nil), rssi: -95)
[RxBLEKit|VERB|14:09:37.035]: CentralManager(10861602112) didDiscover(peripheral: Peripheral(uuid: DAAD03EF-BBCC-EE38-3FE5-8E0AF65D9C3B, name: nil), rssi: -71)
[RxBLEKit|VERB|14:09:37.038]: CentralManager(10861602112) didDiscover(peripheral: Peripheral(uuid: 635CC333-023C-82F4-685B-2CEFC60B6A90, name: nil), rssi: -89)
[RxBLEKit|VERB|14:09:37.041]: CentralManager(10861602112) didDiscover(peripheral: Peripheral(uuid: 5894D3E2-0111-F865-D699-715B1DC5A83C, name: nil), rssi: -92)
[RxBLEKit|VERB|14:09:37.048]: CentralManager(10861602112) didDiscover(peripheral: Peripheral(uuid: C353879B-6DA4-8730-CBDA-828E1B82B9CD, name: nil), rssi: -79)
[RxBLEKit|VERB|14:09:37.064]: CentralManager(10861602112) didDiscover(peripheral: Peripheral(uuid: E357C250-08A8-7093-331A-9AA655CF3D57, name: nil), rssi: -85)
[RxBLEKit|VERB|14:09:37.066]: CentralManager(10861602112) didDiscover(peripheral: Peripheral(uuid: 6A30D0D0-0115-A264-903D-0BFECDE6F03D, name: nil), rssi: -82)
[RxBLEKit|VERB|14:09:37.068]: CentralManager(10861602112) didDiscover(peripheral: Peripheral(uuid: 7916FE15-9719-5F82-6B60-E0CF7EE78F85, name: nil), rssi: -81)
[RxBLEKit|VERB|14:09:37.070]: CentralManager(10861602112) didDiscover(peripheral: Peripheral(uuid: 5371ABF5-25AC-EF11-4251-57F928BA76E3, name: nil), rssi: -94)
[RxBLEKit|VERB|14:09:37.073]: CentralManager(10861602112) didDiscover(peripheral: Peripheral(uuid: 0DF38A38-12B8-1EDD-FF46-60BF9FDB906A, name: nil), rssi: -61)
[RxBLEKit|VERB|14:09:37.076]: CentralManager(10861602112) didDiscover(peripheral: Peripheral(uuid: FF294989-156C-CAF4-540F-3CAF459E3559, name: nil), rssi: -65)
[RxBLEKit|VERB|14:09:37.078]: CentralManager(10861602112) didDiscover(peripheral: Peripheral(uuid: 7410F5EA-CDA5-7805-F63F-D255F83CE5DF, name: nil), rssi: -78)
[RxBLEKit|VERB|14:09:37.082]: CentralManager(10861602112) didDiscover(peripheral: Peripheral(uuid: 45D92E51-0493-CBB1-1EAD-C0FEC42A38F0, name: nil), rssi: -83)
[RxBLEKit|VERB|14:09:37.085]: CentralManager(10861602112) didDiscover(peripheral: Peripheral(uuid: 68E8E2B9-A2F0-5EBF-DD87-B0A30275E0EA, name: nil), rssi: -85)
[RxBLEKit|VERB|14:09:37.085]: CentralManager(10861602112) didDiscover(peripheral: Peripheral(uuid: 1C1F2531-F8C6-A490-B508-79408B956499, name: nil), rssi: -72)
[RxBLEKit|VERB|14:09:37.094]: CentralManager(10861602112) didDiscover(peripheral: Peripheral(uuid: F128AAB5-E8B4-D9BC-E137-A7304DE79FDA, name: nil), rssi: -85)
[RxBLEKit|VERB|14:09:37.095]: CentralManager(10861602112) didDiscover(peripheral: Peripheral(uuid: D0E5CAC3-1F6C-CD1F-E3BD-04D3502AE716, name: nil), rssi: -85)
[RxBLEKit|VERB|14:09:37.101]: CentralManager(10861602112) didDiscover(peripheral: Peripheral(uuid: 5DEDA521-58E0-8FCF-AEB8-C6C638E6F763, name: nil), rssi: -90)
[RxBLEKit|VERB|14:09:37.104]: CentralManager(10861602112) didDiscover(peripheral: Peripheral(uuid: 59853C3F-7A57-37AF-30D7-5086321DA860, name: nil), rssi: -77)
[RxBLEKit|VERB|14:09:37.106]: CentralManager(10861602112) didDiscover(peripheral: Peripheral(uuid: 59066EAE-E91B-57C9-64B8-5046359F02EE, name: nil), rssi: -96)
[RxBLEKit|VERB|14:09:37.108]: CentralManager(10861602112) didDiscover(peripheral: Peripheral(uuid: 620C7A60-5B38-365F-882C-207C6CF9D44D, name: nil), rssi: -79)
[RxBLEKit|VERB|14:09:37.118]: CentralManager(10861602112) didDiscover(peripheral: Peripheral(uuid: 566EF8CD-4476-6CAF-A3B5-D21455026E2B, name: nil), rssi: -74)
[RxBLEKit|VERB|14:09:37.120]: CentralManager(10861602112) didDiscover(peripheral: Peripheral(uuid: D03B86FD-F74A-FA6B-8015-C564B8D2F2FC, name: nil), rssi: -63)
[RxBLEKit|VERB|14:09:37.123]: CentralManager(10861602112) didDiscover(peripheral: Peripheral(uuid: CD451EAC-2E08-EF75-E007-3F24B58F0C59, name: nil), rssi: -71)
[RxBLEKit|VERB|14:09:37.131]: CentralManager(10861602112) didDiscover(peripheral: Peripheral(uuid: EE3740E2-7F0B-FACD-A0CC-699B207DA695, name: nil), rssi: -80)
[RxBLEKit|VERB|14:09:37.135]: CentralManager(10861602112) didDiscover(peripheral: Peripheral(uuid: 645995AE-821F-8868-D91F-6F7CBE4BDAED, name: nil), rssi: -87)
[RxBLEKit|VERB|14:09:37.137]: CentralManager(10861602112) didDiscover(peripheral: Peripheral(uuid: 8BB3F02C-ABF1-1099-1F78-CC6408EABC84, name: nil), rssi: 127)
[RxBLEKit|VERB|14:09:37.143]: CentralManager(10861602112) didDiscover(peripheral: Peripheral(uuid: 80293EA3-F380-A86F-B84F-DFC1A5B23502, name: Optional("XFit")), rssi: -62)
[RxBLEKit|VERB|14:09:37.147]: CentralManager(10861602112) didDiscover(peripheral: Peripheral(uuid: 5AAB65A4-5283-AEEB-EDDA-8F3AD450DE71, name: nil), rssi: -66)
[RxBLEKit|DEBG|14:09:37.154]: CentralManager(10861602112) stopScan()
[RxBLEKit|DEBG|14:09:37.154]: CentralManager(10861602112) retrievePeripherals(withIdentifiers: [80293EA3-F380-A86F-B84F-DFC1A5B23502])
[RxBLEKit|DEBG|14:09:37.157]: CentralManager(10861602112) connect(peripheral: Peripheral(uuid: 80293EA3-F380-A86F-B84F-DFC1A5B23502, name: Optional("XFit")), options: nil)
[RxBLEKit|DEBG|14:09:37.391]: Peripheral(uuid: 80293EA3-F380-A86F-B84F-DFC1A5B23502, name: Optional("XFit")) discoverServices(serviceUUIDs: nil)
[RxBLEKit|DEBG|14:09:37.843]: Peripheral(uuid: 80293EA3-F380-A86F-B84F-DFC1A5B23502, name: Optional("XFit")) didDiscoverServices(services: Optional("[Service(uuid: Device Information, id: 10861745600), Service(uuid: 9A8CA9EF-E43F-4157-9FEE-C37A3D7DC12D, id: 10861742784), Service(uuid: EF66CCAD-F4A8-4C51-B025-BC2A2C9FDAA6, id: 10861740928)]"), error: nil)
[RxBLEKit|DEBG|14:09:37.843]: Peripheral(uuid: 80293EA3-F380-A86F-B84F-DFC1A5B23502, name: Optional("XFit")) discoverCharacteristics(characteristicUUIDs: nil, for: Service(uuid: Device Information, id: 10861745600))
[RxBLEKit|DEBG|14:09:37.844]: Peripheral(uuid: 80293EA3-F380-A86F-B84F-DFC1A5B23502, name: Optional("XFit")) discoverCharacteristics(characteristicUUIDs: nil, for: Service(uuid: 9A8CA9EF-E43F-4157-9FEE-C37A3D7DC12D, id: 10861742784))
[RxBLEKit|DEBG|14:09:37.844]: Peripheral(uuid: 80293EA3-F380-A86F-B84F-DFC1A5B23502, name: Optional("XFit")) discoverCharacteristics(characteristicUUIDs: nil, for: Service(uuid: EF66CCAD-F4A8-4C51-B025-BC2A2C9FDAA6, id: 10861740928))
[RxBLEKit|DEBG|14:09:37.963]: Peripheral(uuid: 80293EA3-F380-A86F-B84F-DFC1A5B23502, name: Optional("XFit")) didDiscoverCharacteristicsFor(for: Service(uuid: Device Information, id: 10861745600), characteristics: Optional("[Characteristic(uuid: Manufacturer Name String, id: 11081318496), Characteristic(uuid: Model Number String, id: 11081319168), Characteristic(uuid: Serial Number String, id: 11081329536)]"), error: nil)
[RxBLEKit|DEBG|14:09:38.083]: Peripheral(uuid: 80293EA3-F380-A86F-B84F-DFC1A5B23502, name: Optional("XFit")) didDiscoverCharacteristicsFor(for: Service(uuid: 9A8CA9EF-E43F-4157-9FEE-C37A3D7DC12D, id: 10861742784), characteristics: Optional("[Characteristic(uuid: E94F85C8-7F57-4DBD-B8D3-2B56E107ED60, id: 11081092000), Characteristic(uuid: A8985FDA-51AA-4F19-A777-71CF52ABBA1E, id: 11081092096)]"), error: nil)
[RxBLEKit|DEBG|14:09:38.205]: Peripheral(uuid: 80293EA3-F380-A86F-B84F-DFC1A5B23502, name: Optional("XFit")) didDiscoverCharacteristicsFor(for: Service(uuid: EF66CCAD-F4A8-4C51-B025-BC2A2C9FDAA6, id: 10861740928), characteristics: Optional("[Characteristic(uuid: 5B7DD565-6E90-4DF8-B806-F4AC85DF74CA, id: 11081326656), Characteristic(uuid: C8FB3A51-D44C-4D9F-A8EC-A7598C1BF2EA, id: 11081329440), Characteristic(uuid: D8B2C95B-B317-47CA-AC02-CCFD3D85A666, id: 11081319456), Characteristic(uuid: 7127A1B2-ED4D-433A-9780-5A9E38F6A040, id: 11081330016)]"), error: nil)
[RxBLEKit|DEBG|14:09:38.283]: Peripheral(uuid: 80293EA3-F380-A86F-B84F-DFC1A5B23502, name: Optional("XFit")) setNotifyValue(enabled: true, for: Characteristic(uuid: D8B2C95B-B317-47CA-AC02-CCFD3D85A666, id: 11081319456))
[RxBLEKit|DEBG|14:09:38.284]: Peripheral(uuid: 80293EA3-F380-A86F-B84F-DFC1A5B23502, name: Optional("XFit")) didUpdateNotificationStateFor(for:Characteristic(uuid: D8B2C95B-B317-47CA-AC02-CCFD3D85A666, id: 11081319456), isNotifying: false, error: Optional(Error Domain=CBATTErrorDomain Code=10 "The attribute could not be found." UserInfo={NSLocalizedDescription=The attribute could not be found.}))
[RxBLEKit|DEBG|14:09:38.286]: Peripheral(uuid: 80293EA3-F380-A86F-B84F-DFC1A5B23502, name: Optional("XFit")) setNotifyValue(enabled: false, for: Characteristic(uuid: D8B2C95B-B317-47CA-AC02-CCFD3D85A666, id: 11081319456))
[RxBLEKit|DEBG|14:09:38.287]: Peripheral(uuid: 80293EA3-F380-A86F-B84F-DFC1A5B23502, name: Optional("XFit")) didUpdateNotificationStateFor(for:Characteristic(uuid: D8B2C95B-B317-47CA-AC02-CCFD3D85A666, id: 11081319456), isNotifying: false, error: Optional(Error Domain=CBATTErrorDomain Code=10 "The attribute could not be found." UserInfo={NSLocalizedDescription=The attribute could not be found.}))
2019-05-22 16:09:40.107097+0200 crossfitApp[3330:989903] [] nw_socket_handle_socket_event [C131254.1:1] Socket SO_ERROR [61: Connection refused]
  • JS logs:

Characteristic properties extracted from Chrome devtools

voltageCharacteristic: Characteristic
deviceID: "80293EA3-F380-A86F-B84F-DFC1A5B23502"
id: 10794864096
isIndicatable: false
isNotifiable: true
isNotifying: false
isReadable: false
isWritableWithResponse: false
isWritableWithoutResponse: false
serviceID: 10746901760
serviceUUID: "ef66ccad-f4a8-4c51-b025-bc2a2c9fdaa6"
uuid: "d8b2c95b-b317-47ca-ac02-ccfd3d85a666"
value: null

Error stack trace

"BleError: Characteristic d8b2c95b-b317-47ca-ac02-ccfd3d85a666 notify change failed for device 80293EA3-F380-A86F-B84F-DFC1A5B23502 and service ef66ccad-f4a8-4c51-b025-bc2a2c9fdaa6

at parseBleError (blob:http://10.80.148.183:8081/e724eaee-ffd5-4243-9d1e-3c4c983e62ea:112674:18)

at monitorListener (blob:http://10.80.148.183:8081/e724eaee-ffd5-4243-9d1e-3c4c983e62ea:113739:50)

at RCTDeviceEventEmitter.emit (blob:http://10.80.148.183:8081/e724eaee-ffd5-4243-9d1e-3c4c983e62ea:6131:37)

at MessageQueue.__callFunction (blob:http://10.80.148.183:8081/e724eaee-ffd5-4243-9d1e-3c4c983e62ea:2587:44)

at blob:http://10.80.148.183:8081/e724eaee-ffd5-4243-9d1e-3c4c983e62ea:2344:17

at MessageQueue.__guard (blob:http://10.80.148.183:8081/e724eaee-ffd5-4243-9d1e-3c4c983e62ea:2541:13)

at MessageQueue.callFunctionReturnFlushedQueue (blob:http://10.80.148.183:8081/e724eaee-ffd5-4243-9d1e-3c4c983e62ea:2343:14)

at http://10.80.148.183:8081/debugger-ui/debuggerWorker.js:80:58"
  • Contents of the package.json file:
{
  "name": "voltageApp",
  "version": "0.0.1",
  "private": true,
  "scripts": {
    "start": "node node_modules/react-native/local-cli/cli.js start",
    "test": "jest",
    "android": "react-native run-android",
    "ios": "react-native run-ios"
  },
  "dependencies": {
    "react": "16.8.3",
    "react-native": "0.59.8",
    "react-native-ble-plx": "^1.0.3",
    "react-native-gesture-handler": "^1.2.1",
    "react-navigation": "^3.9.1"
  },
  "devDependencies": {
    "@babel/core": "^7.4.4",
    "@babel/runtime": "^7.4.4",
    "babel-jest": "^24.8.0",
    "jest": "^24.8.0",
    "metro-react-native-babel-preset": "^0.54.0",
    "react-test-renderer": "16.8.3"
  },
  "jest": {
    "preset": "react-native"
  }
}
  • Formatted code sample or link to a repository:

  const SERVICE_SNIFFER_UUID = 'ef66ccad-f4a8-4c51-b025-bc2a2c9fdaa6'
  const SNIFFER_STATUS_UUID = '5b7dd565-6e90-4df8-b806-f4ac85df74ca'
  const SNIFFER_SPEED_UUID = 'c8fb3a51-d44c-4d9f-a8ec-a7598c1bf2ea'
  const SNIFFER_VOLTAGE_UUID = 'd8b2c95b-b317-47ca-ac02-ccfd3d85a666'

  scanAndConnect () {
    this.manager.startDeviceScan(null, null, (error, device) => {
      if (error) {
        // Handle error (scanning will be stopped automatically)
        this.setError(error)
        return false
      }

      // Check if it is a device you are looking for based on advertisement data or other criteria.
      if (device.name === 'XXX' || device.localName === 'Sniffer') {
        this.device = device
        this.manager.stopDeviceScan()

        device.connect()
          .then((device) => {
            return device.discoverAllServicesAndCharacteristics()
          })
          .then((device) => {
            return this.setupNotifications(device)
          })
          .then(() => {
            this.setInfo("Listening...")
          }, (error) => {
            this.setError(error.message)
          })
      }
    })
  }

  async setupNotifications(device) {
    let snifferService = null

    device.services().then(services => {
      let voltageCharacteristic = null

      snifferService = services.filter(service => service.uuid === SERVICE_SNIFFER_UUID)[0]
      snifferService.characteristics()
        .then(characteristics => {
         // voltageCharacteristic is retrieved correctly and data is also seems correct
          voltageCharacteristic = characteristics.filter(c => c.uuid === SNIFFER_VOLTAGE_UUID)[0]
          voltageCharacteristic.monitor((error, c) => {
           // RECEIVED THE ERROR HERE (voltageCharacteristic.notifiable === true)
          })
        })
        .catch(error => console.log(error))
    })
  }

Issue Analytics

  • State:closed
  • Created 4 years ago
  • Comments:27 (1 by maintainers)

github_iconTop GitHub Comments

4reactions
packetstracercommented, May 27, 2019

Just to be sure. Is Client Characteristic Configuration Descriptor present for your characteristic? You can check it with nRF Connect app for example.

@Cierpliwy I’ve investigated about the Client Characteristic Configuration descriptor for the characteristic that was notifying, and It wasn’t set. So I’ve created the descriptor and added to the characteristic and now everything works fine.

Thanks a lot!!

For the sake of future information for people having the same issue, I attach some info about Client Characteristic Configuration descriptor:

What is this descriptor:

Associated with the idea of indications/notifications, is the architected BLE Descriptor called “Client Characteristic Configuration” which has UUID 0x2902. This contains (among other things) two distinct bit fields that can be on or off. One bit field governs Notifications while the other governs Indications. If the corresponding bit is on, then the server can/may send the corresponding push. For example if the Notifications bit is on, then the server can/may send notifications. The primary purpose of the descriptor is to allow a partner (a client) to request that the server actually send notifications or indications. Here is an example. Imagine that we have a BLE Server that can publish notifications when data changes. Now imagine that a BLE Client connects but is actually not interested in receiving these. If the BLE Server executes a notification push and sends the data, that will be wasted effort/energy as the client doesn’t want or can’t use the information. What we really want is that the client should inform the server that if it wants to push new data then it either should or shouldn’t. And that is where this descriptor comes into play. If the descriptor is present on a characteristic then then client can remotely change the bit flag to enable or disable notifications and indications. Since the descriptor flag is stored locally within the server, the server is at liberty to examine the flag before performing a radio transmission. What this means is that the client/peer can toggle on or off its desire to receive notifications and the server should honor those requests.

Extracted from https://github.com/nkolban/esp32-snippets/blob/master/Documentation/BLE%20C%2B%2B%20Guide.pdf

How I created this descriptor in Arduino for the characteristic that notifies de values:

  BLEService *pService = pServer->createService(SERVICE_SNIFFER_UUID);

  BLECharacteristic *pCharSnifferVoltage = pService->createCharacteristic(
    SNIFFER_VOLTAGE_UUID,
    BLECharacteristic::PROPERTY_NOTIFY
  );

  // create CCC descriptor and add it to the characteristic
  BLEDescriptor *pClientCharacteristicConfigDescriptor = new BLEDescriptor((uint16_t)0x2902);
  pCharSnifferVoltage->addDescriptor(pClientCharacteristicConfigDescriptor);

  pService->start();
3reactions
amerilescommented, Mar 6, 2021

If I disable in the iOS project the line that throws the error it works properly (notification handler executes whenever the peripheral broadcasts a value, and the characteristic has that value). Peripheral.swift (line 334)

    public func setNotifyValue(_ enabled: Bool,
                               for characteristic: Characteristic) -> Observable<Characteristic> {
        let observable = peripheral
            .rx_didUpdateNotificationStateForCharacteristic
            .filter { $0.0 == characteristic.characteristic }
            .take(1)
            .map { (_, error) -> Characteristic in
                if let error = error {
                    /// throw BluetoothError.characteristicNotifyChangeFailed(characteristic, error)
                }
                return characteristic
            }
        return ensureValidPeripheralStateAndCallIfSucceeded(
            for: observable,
            postSubscriptionCall: { [weak self] in
                self?.peripheral.setNotifyValue(enabled, for: characteristic.characteristic)
            }
        )
    }

Any workaround for v2 ?

You can:

  1. Open workspace with XCode
  2. Expand Pods project
  3. Open Pods folder
  4. Look for MultiplatformBleAdapter folder and open it
  5. Look for the Peripheral.swift file, make the change and build

Awful solution I know, but works for a workaround until we can have a better way

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