从 BLUE 读取多个特征并读取字符串

Question

所以我有两个问题。让我们从第一个开始，你如何让两个 readCharacteristic 在彼此之后？我展示的代码是我认为你可以做到的。但是因为在第一个 readCharacteristic 调用中尚未调用 onCharacteristicRead，因此不会触发下一个 readCharacteristic。在这里，我通过在 onCharacteristicRead 中的第一个 readCharacteristic 的 if 语句中调用第二个 readCharacteristic 来解决它，但我不知道这是 normal/stupid 解决方案吗？

public void onServicesDiscovered(final BluetoothGatt gatt, int status) {
    if (status == BluetoothGatt.GATT_SUCCESS) {
        BluetoothGattService mBluetoothGattService = gatt.getService(UUID.fromString(CSUuid));
        if (mBluetoothGattService != null) {
            Log.i(TAG, "Connection State: Service characteristic UUID found: " + mBluetoothGattService.getUuid().toString());
            mCharacterisitc = mBluetoothGattService.getCharacteristic(UUID.fromString(UuidRead));
            mCharacterisitc2 = mBluetoothGattService.getCharacteristic(UUID.fromString(UuidRead2));
            Log.w(TAG, "Connection State 1: mCharacterisitc " + mCharacterisitc + " " + mCharacterisitc2);
            readCharacteristic(gatt, mCharacterisitc);
            //I know I have to wait for the above is done, but can I do it here instead of
            //calling the line under in onCharacteristicRead? 
            readCharacteristic(gatt, mCharacterisitc2);
        } else {
            Log.i(TAG, "Connection State: Service characteristic not found for UUID: " + UuidRead);
        }
    }
}

下一题我觉得有点难？

the code is made in PSoC creator 4.3

所以目前我从我的 PSoC 6 BLE 设备读取了一个整数，另一个字母 'M' 转换为整数并返回到应用程序端的 'M' 。我只读 SIGNLE 'M' 的原因是因为我不知道如何发送 whole string 之类的 'Made it'。我认为我遇到的问题是 PSoC side，我不知道如何 read a whole string。

for(;;)
{
    /* Place your application code here. https://www.youtube.com/watch?v=Aeip0hkc4YE*/
    cy_stc_ble_gatt_handle_value_pair_t serviceHandle;
    cy_stc_ble_gatt_value_t serviceData;
    
    //this is the variables I've declared earlier in the code
    //static uint8 data[1] = {0}; 
    //static char * ValStr;
    
    //here I just have a simple Integer which count up every sec
    serviceData.val = (uint8*)data;
    serviceData.len = 1;
    
    serviceHandle.attrHandle = CY_BLE_CUSTOM_SERVICE_DEVICE_OUTBOUND_CHAR_HANDLE;
    serviceHandle.value = serviceData;
    
    Cy_BLE_GATTS_WriteAttributeValueLocal(&serviceHandle); //sending the data to -> OUTBOUND
    
    //this part should probably not be in a for-loop, but for now it is.
    ValStr = "Mads Sander Hoegstrup"; //I want read whole string on my android APP
    serviceData.val = (uint8*) ValStr; //this only takes the 'M' and thats the only variable I can read from my APP not the rest of the string
    serviceData.len = 1; //Does not help to increase, if it's more than 1 I read 0 and not a letter
    
    serviceHandle.attrHandle = CY_BLE_CUSTOM_SERVICE_DEVICE_OUTBOUND_2_CHAR_HANDLE;
    serviceHandle.value = serviceData;
    
    Cy_BLE_GATTS_WriteAttributeValueLocal(&serviceHandle); //sending the data to -> OUTBOUND_2
    
    data[0]++;
    CyDelay(1000);
}

在这里你可以看到我修改了正确的值，一个整数和一个字符串，但只有字母 'M' 而不是字符串 'Mads Sander Hoegstrup'

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Answer 1

你最好分开问两个问题，因为它们之间没有任何关系。

我会回答第一个问题。您不能在两次读取之间的 onServicesDiscovered 方法内等待。即使您等待 30 秒，它也不会起作用。原因是只有一个线程可以运行同时在每个 BluetoothGatt 对象上回调，它是 onCharacteristicRead 的调用者清除内部 gatt 忙标志，否则会阻止你提交另一个请求。如果你愿意，你最好实现一些队列机制来保持代码更清晰。

从 BLUE 读取多个特征并读取字符串

read mutiple characteristic from BLE and reading a string

c

java

android

bluetooth-lowenergy

cypress-psoc