mirror of https://github.com/arendst/Tasmota.git
246 lines
9.7 KiB
Markdown
246 lines
9.7 KiB
Markdown
# Server API differnces:
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### Characteristics:
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When creating a characteristic the properties are now set with `NIMBLE_PROPERTY::XXXX` instead of `BLECharacteristic::XXXX`.
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#### Previous:
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```
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BLECharacteristic::PROPERTY_READ |
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BLECharacteristic::PROPERTY_WRITE
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```
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#### Changed to:
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```
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NIMBLE_PROPERTY::READ |
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NIMBLE_PROPERTY::WRITE
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```
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#### The full list of properties:
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```
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NIMBLE_PROPERTY::READ
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NIMBLE_PROPERTY::READ_ENC
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NIMBLE_PROPERTY::READ_AUTHEN
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NIMBLE_PROPERTY::READ_AUTHOR
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NIMBLE_PROPERTY::WRITE
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NIMBLE_PROPERTY::WRITE_NR
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NIMBLE_PROPERTY::WRITE_ENC
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NIMBLE_PROPERTY::WRITE_AUTHEN
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NIMBLE_PROPERTY::WRITE_AUTHOR
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NIMBLE_PROPERTY::BROADCAST
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NIMBLE_PROPERTY::NOTIFY
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NIMBLE_PROPERTY::INDICATE
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```
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### Descriptors:
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Descriptors are now created using the NimBLEcharacteristic method `createDescriptor()`.
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The previous method `addDescriptor()` is now a private function in the library.
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This was done because the NimBLE host automatically creates a 0x2902 descriptor if a characteristic has notify or indicate properties applied.
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Due to this fact, this library also creates one automatically for your application.
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The only reason to manually create this descriptor now is to assign callback functions.
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If you do not require this functionality you can safely exclude the manual creation of that descriptor.
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For any other descriptor, (except 0x2904, see below) it should now be created just as characteristics are
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by invoking the `NimBLECharacteristic::createDescriptor` methods.
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Which are defined as:
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```
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NimBLEDescriptor* createDescriptor(const char* uuid,
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uint32_t properties = NIMBLE_PROPERTY::READ |
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NIMBLE_PROPERTY::WRITE,
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uint16_t max_len = 100);
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NimBLEDescriptor* createDescriptor(NimBLEUUID uuid,
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uint32_t properties = NIMBLE_PROPERTY::READ |
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NIMBLE_PROPERTY::WRITE,
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uint16_t max_len = 100);
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```
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##### Example:
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```
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pDescriptor = pCharacteristic->createDescriptor("ABCD",
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NIMBLE_PROPERTY::READ |
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NIMBLE_PROPERTY::WRITE |
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NIMBLE_PROPERTY::WRITE_ENC,
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25);`
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```
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Would create a descriptor with the UUID 0xABCD, publicly readable but only writable if paired/bonded (encrypted) and has a max value length of 25 bytes.
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For the 0x2904 descriptor, there is a special class that is created when you call `createDescriptor("2904")`.
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The pointer returned is of the base class `NimBLEDescriptor` but the call will create the derived class of `NimBLE2904` so you must cast the returned pointer to `NimBLE2904*` to access the specific class methods.
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##### Example:
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```
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p2904 = (NimBLE2904*)pCharacteristic->createDescriptor("2904");
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```
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#### Server Security:
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Security is set on the characteristic or descriptor properties by applying one of the following:
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```
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NIMBLE_PROPERTY::READ_ENC
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NIMBLE_PROPERTY::READ_AUTHEN
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NIMBLE_PROPERTY::READ_AUTHOR
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NIMBLE_PROPERTY::WRITE_ENC
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NIMBLE_PROPERTY::WRITE_AUTHEN
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NIMBLE_PROPERTY::WRITE_AUTHOR
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```
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When a peer wants to read or write a characteristic or descriptor with any of these properties applied
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it will trigger the pairing process. By default the "just-works" pairing will be performed automatically.
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This can be changed to use passkey authentication or numeric confirmation. See below for details.
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# Client API Differences:
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The `BLEAdvertisedDeviceCallbacks` class `onResult()` method now receives a pointer to the
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`NimBLEAdvertisedDevice` object instead of a copy.
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`NimBLEClient::connect()` now takes an extra parameter to indicate if the client should download the services
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database from the peripheral, default value is true.
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Defined as:
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```
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bool connect(NimBLEAdvertisedDevice* device, bool refreshServices = true);
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bool connect(NimBLEAddress address, uint8_t type = BLE_ADDR_PUBLIC, bool refreshServices = true);
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```
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If set to false the client will use the services database it retrieved from the peripheral last time it connected.
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This allows for faster connections and power saving if the devices just dropped connection and want to reconnect.
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```
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NimBLERemoteCharacteristic::writeValue();
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NimBLERemoteCharacteristic::registerForNotify();
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```
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Now return true or false to indicate success or failure so you can choose to disconnect or try again.
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```
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NimBLEClient::getServices()
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NimBLERemoteService::getCharacteristics()
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```
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Now return a pointer to a `std::vector` of the respective object database instead of `std::map`.
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`NimBLERemoteService::getCharacteristicsByHandle()`
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Has been removed from the API as it is no longer maintained in the library.
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The last two above changes reduce the heap usage significantly with minimal application code adjustments.
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**UPDATED** on June 21, 2020
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> ```
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> NimBLEClient::getServices(bool refresh = false)
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> NimBLERemoteService::getCharacteristics(bool refresh = false)
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> NimBLERemoteCharacteristic::getDecriptors(bool refresh = false)
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>```
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These methods now take an optional (bool) parameter.
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If true it will clear the respective vector and retrieve all the respective attributes from the peripheral.
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If false(default) it will return the respective vector empty or otherwise with the currently stored attributes.
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**Removed:** the automatic discovery of all peripheral attributes as they consumed time and resources for data
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the user may not be interested in.
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**Added:** `NimBLEClient::discoverAtrributes()` for the user to discover all the peripheral attributes
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to replace the the former functionality.
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> ```
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>getService(NimBLEUUID)
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>getCharacteristic(NimBLEUUID)
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>getDescriptor(NimBLEUUID)
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>```
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These methods will now check the respective vectors for the attribute object and, if not found, will retrieve (only)
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the specified attribute from the peripheral.
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These changes allow more control for the user to manage the resources used for the attributes.
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***
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#### Client Security:
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The client will automatically initiate security when the peripheral responds that it's required.
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The default configuration will use "just-works" pairing with no bonding, if you wish to enable bonding see below.
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# Security:
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Security callback functions are now incorporated in the client/server Callbacks class.
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However backward compatibility with the `BLESecurity` class is retained to minimize app code changes.
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The relevant server callbacks are defined as:
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```
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bool onConfirmPIN(uint32_t pin); // accept or reject the passkey
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void onAuthenticationComplete(ble_gap_conn_desc* desc); // auth complete - details in desc
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bool onPassKeyNotify(uint32_t pass_key); // receive the passkey sent by the client, accept or reject
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```
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The relevant client callbacks are defined as:
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```
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bool onConfirmPIN(uint32_t pin); // accept or reject the passkey
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void onAuthenticationComplete(ble_gap_conn_desc* desc); // auth complete - details in desc
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uint32_t onPassKeyRequest(); // return the passkey to send to the server
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```
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Security settings and IO capabilities are now set by the corresponding method of `NimBLEDevice::`.
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```
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static void setSecurityAuth(bool bonding, bool mitm, bool sc);
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static void setSecurityAuth(uint8_t auth_req);
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static void setSecurityIOCap(uint8_t iocap);
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static void setSecurityInitKey(uint8_t init_key);
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static void setSecurityRespKey(uint8_t init_key);
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/**
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* @brief Set the authorization mode for this device.
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* @param bonding, if true we allow bonding, false no bonding will be performed.
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* @param mitm, if true we are capable of man in the middle protection, false if not.
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* @param sc, if true we will perform secure connection pairing, false we will use legacy pairing.
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*/
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void NimBLEDevice::setSecurityAuth(bool bonding, bool mitm, bool sc)
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/**
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* @brief Set the authorization mode for this device.
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* @param A bitmap indicating what modes are supported.
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* The bits are defined as follows:
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** 0x01 BLE_SM_PAIR_AUTHREQ_BOND
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** 0x04 BLE_SM_PAIR_AUTHREQ_MITM
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** 0x08 BLE_SM_PAIR_AUTHREQ_SC
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** 0x10 BLE_SM_PAIR_AUTHREQ_KEYPRESS - not yet supported.
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** 0xe2 BLE_SM_PAIR_AUTHREQ_RESERVED - for reference only.
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*/
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void NimBLEDevice::setSecurityAuth(uint8_t auth_req)
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/**
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* @brief Set the Input/Output capabilities of this device.
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* @param One of the following:
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** 0x00 BLE_HS_IO_DISPLAY_ONLY DisplayOnly IO capability
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** 0x01 BLE_HS_IO_DISPLAY_YESNO DisplayYesNo IO capability
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** 0x02 BLE_HS_IO_KEYBOARD_ONLY KeyboardOnly IO capability
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** 0x03 BLE_HS_IO_NO_INPUT_OUTPUT NoInputNoOutput IO capability
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** 0x04 BLE_HS_IO_KEYBOARD_DISPLAY KeyboardDisplay Only IO capability
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*/
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void NimBLEDevice::setSecurityIOCap(uint8_t iocap)
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/**
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* @brief If we are the initiator of the security procedure this sets the keys we will distribute.
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* @param A bitmap indicating which keys to distribute during pairing.
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* The bits are defined as follows:
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** 0x01: BLE_SM_PAIR_KEY_DIST_ENC - Distribute the encryption key.
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** 0x02: BLE_SM_PAIR_KEY_DIST_ID - Distribute the ID key (IRK).
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** 0x04: BLE_SM_PAIR_KEY_DIST_SIGN
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** 0x08: BLE_SM_PAIR_KEY_DIST_LINK
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*/
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void NimBLEDevice::setSecurityInitKey(uint8_t init_key)
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/**
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* @brief Set the keys we are willing to accept during pairing.
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* @param A bitmap indicating which keys to accept during pairing.
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* The bits are defined as follows:
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** 0x01: BLE_SM_PAIR_KEY_DIST_ENC - Accept the encryption key.
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** 0x02: BLE_SM_PAIR_KEY_DIST_ID - Accept the ID key (IRK).
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** 0x04: BLE_SM_PAIR_KEY_DIST_SIGN
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** 0x08: BLE_SM_PAIR_KEY_DIST_LINK
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*/
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void NimBLEDevice::setSecurityRespKey(uint8_t init_key)
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```
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I'm sure there are more things I have forgotten but this is all the majors.
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I will update this document as necessary.
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