如何在CBPeripheral设备上写命令？

Question

我有一个BLE设备，它有两个模块

1-Blue Tooth（BlueCreation BC127A） 附加了2-MicroController，它有一些命令集，如LOGIN RESET VERSION等。

我想向那个与uC通信的BLE写命令。

根据我的规范/文档，数据包结构应该是：

当我在BLE上写完确的命令时，我得到错误：＆＃34;值的长度无效。＆＃34;

根据文档的数据包长度为17，因为我认为这是错误的，因为当我得到它sizeof（byte）/ sizeof（char）;我得到4.我使用了两个值，但我无法获得积极的回应。

我需要帮助才能通过成功编写命令来克服这个问题。这是我与BlueTooth集成的第一个项目。

我的代码 在数据包结构之后，我的命令LOGIN变为：

    NSString *text = @"02 00 0B 00 00 00 01 10 82 10 83 04 05 06 00 00 03";

    const char* byte = [text cStringUsingEncoding:[NSString defaultCStringEncoding]];//(char)[text UTF8String];
    length = sizeof(byte)/sizeof(char);
    //NSData *data = [NSData dataWithBytes:&byte length:length];
    NSData *data = [self dataWithStringHex:text];
    if (self.bleShield.activePeripheral.state == CBPeripheralStateConnected) {
    CBUUID *uuid_service = [CBUUID UUIDWithString:@"67D13B00-89B8-11E3-9DE5-0002A5D5C51B"];
    CBUUID *uuid_char = [CBUUID UUIDWithString:@"892778A0-89B8-11E3-8821-0002A5D5C51B"];
    CBService *service = [self findServiceFromUUID:serviceUUID p:p];

if (!service)
{
    NSLog(@"Could not find service with UUID %@ on peripheral with UUID %@",
          [self CBUUIDToString:serviceUUID],
          p.identifier.UUIDString);

    return;
} 
CBCharacteristic *characteristic = [self findCharacteristicFromUUID:characteristicUUID service:service];

if (!characteristic)
{
    NSLog(@"Could not find characteristic with UUID %@ on service with UUID %@ on peripheral with UUID %@",
          [self CBUUIDToString:characteristicUUID],
          [self CBUUIDToString:serviceUUID],
          p.identifier.UUIDString);

    return;
}

[p writeValue:data forCharacteristic:characteristic type:CBCharacteristicWriteWithResponse];

}

-(CBService *) findServiceFromUUID:(CBUUID *)UUID p:(CBPeripheral *)p {
for(int i = 0; i < p.services.count; i++)
{
    CBService *s = [p.services objectAtIndex:i];
    if ([self compareCBUUID:s.UUID UUID2:UUID])
        return s;
}

return nil; //Service not found on this peripheral }

-(CBCharacteristic *) findCharacteristicFromUUID:(CBUUID *)UUID service:(CBService*)service {
for(int i=0; i < service.characteristics.count; i++)
{
    CBCharacteristic *c = [service.characteristics objectAtIndex:i];
    if ([self compareCBUUID:c.UUID UUID2:UUID]) return c;
}

return nil; //Characteristic not found on this service }

- (NSData *)dataWithStringHex:(NSString *)string {
NSString *cleanString;
cleanString = [string stringByReplacingOccurrencesOfString:@"<" withString:@""];
cleanString = [cleanString stringByReplacingOccurrencesOfString:@">" withString:@""];
cleanString = [cleanString stringByReplacingOccurrencesOfString:@" " withString:@""];

NSInteger length = [cleanString length];
uint8_t buffer[length/2];
for (NSInteger i = 0; i < length; i+=2)
{
    unsigned result = 0;
    NSScanner *scanner = [NSScanner scannerWithString:[cleanString substringWithRange:NSMakeRange(i, 2)]];
    [scanner scanHexInt:&result];
    buffer[i/2] = result;
}
return  [[NSMutableData alloc] initWithBytes:&buffer   length:length/2]; }

感谢。

Answer 1

我们认为蓝牙型号尚未完成配置。

请检查BLE模块的虚拟机应用程序软件。 确认系统在接收数据时添加了响应函数。