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| Both sides previous revisionPrevious revisionNext revision | Previous revision | ||
| en:iot-open:practical:hardware:sut:stm32:iot_6 [2024/05/03 15:34] – ktokarz | en:iot-open:practical:hardware:sut:stm32:iot_6 [2024/05/04 08:10] (current) – ktokarz | ||
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| While none of the standard UUIDs fits your device you need to define your own UUID. It must be 128-bit long and can be randomly generated with the tool available on the website https:// | While none of the standard UUIDs fits your device you need to define your own UUID. It must be 128-bit long and can be randomly generated with the tool available on the website https:// | ||
| The service UUID and characteristic UUID must differ. Although they can be completely different in many implementations the UUIDs of characteristics grouped under one service differ on one digit. | The service UUID and characteristic UUID must differ. Although they can be completely different in many implementations the UUIDs of characteristics grouped under one service differ on one digit. | ||
| - | < | + | < |
| #define SERVICE_UUID | #define SERVICE_UUID | ||
| #define CHARACTERISTIC_UUID " | #define CHARACTERISTIC_UUID " | ||
| Line 63: | Line 63: | ||
| The function creates and initialises the BLE device instance named "SUT STM BLE". It creates a service with the characteristic, | The function creates and initialises the BLE device instance named "SUT STM BLE". It creates a service with the characteristic, | ||
| - | < | + | < |
| void setup() { | void setup() { | ||
| | | ||
| Line 90: | Line 90: | ||
| </ | </ | ||
| - | In the loop function, we need to call a function waiting for the connection of the client. | + | In the loop function, we need to call a function waiting for the connection of the client |
| - | < | + | < |
| void loop() { | void loop() { | ||
| - | // listen for BLE peripherals | + | // listen for BLE central device |
| BLE.central(); | BLE.central(); | ||
| } | } | ||
| Line 105: | Line 105: | ||
| While we have analysed the client' | While we have analysed the client' | ||
| Add the libraries to the platformio.ini. | Add the libraries to the platformio.ini. | ||
| - | < | + | < |
| lib_deps = | lib_deps = | ||
| stm32duino/ | stm32duino/ | ||
| Line 111: | Line 111: | ||
| </ | </ | ||
| And import libraries into the cpp file. | And import libraries into the cpp file. | ||
| - | < | + | < |
| #include " | #include " | ||
| #include " | #include " | ||
| Line 117: | Line 117: | ||
| </ | </ | ||
| Next, we define the UUIDs for remote service and a characteristic. Notice they must match the ones defined in the server. | Next, we define the UUIDs for remote service and a characteristic. Notice they must match the ones defined in the server. | ||
| - | < | + | < |
| // The remote service we wish to connect to. | // The remote service we wish to connect to. | ||
| #define REMOTE_SERVICE_UUID " | #define REMOTE_SERVICE_UUID " | ||
| Line 127: | Line 127: | ||
| </ | </ | ||
| Some global class objects and variables will be needed for our software. | Some global class objects and variables will be needed for our software. | ||
| - | < | + | < |
| // Variables | // Variables | ||
| HCISharedMemTransportClass HCISharedMemTransport; | HCISharedMemTransportClass HCISharedMemTransport; | ||
| Line 143: | Line 143: | ||
| In the setup() function we initialise LCD and Bluetooth and start scanning for the device having the service UUID we want to connect. | In the setup() function we initialise LCD and Bluetooth and start scanning for the device having the service UUID we want to connect. | ||
| - | < | + | < |
| void setup() { | void setup() { | ||
| // initialise LCD | // initialise LCD | ||
| Line 166: | Line 166: | ||
| </ | </ | ||
| - | The second callback class helps to inform the other parts of the program about the connection close. It will additionally inform us about the current state of the program. | ||
| - | < | ||
| - | class MyClientCallback : public BLEClientCallbacks { | ||
| - | void onConnect(BLEClient* pclient) { | ||
| - | lcd.setCursor(0, | ||
| - | lcd.print(" | ||
| - | } | ||
| - | |||
| - | void onDisconnect(BLEClient* pclient) { | ||
| - | lcd.setCursor(0, | ||
| - | lcd.print(" | ||
| - | lcd.setCursor(0, | ||
| - | connected = false; | ||
| - | } | ||
| - | };</ | ||
| - | |||
| - | |||
| - | In the loop() function, we wait for the information that the server with the service UUID we were interested in was found. It is signalled with the use of " | ||
| - | \\ | ||
| In a loop() function we check if a peripheral with UUID we are interested in was discovered. If so we check its name. If the remote device' | In a loop() function we check if a peripheral with UUID we are interested in was discovered. If so we check its name. If the remote device' | ||
| Line 193: | Line 174: | ||
| if (peripheral) { | if (peripheral) { | ||
| - | if (peripheral.localName() = "SUT STM BLE") { | + | if (peripheral.localName() |
| // display remote name | // display remote name | ||
| Line 239: | Line 220: | ||
| - Disconnects from the remote server. | - Disconnects from the remote server. | ||
| - | < | + | < |
| void display_characteristic(BLEDevice peripheral) { | void display_characteristic(BLEDevice peripheral) { | ||
| | | ||
