The recent mobile phones support BLE 5 and they are backward compatible. That means they can connect to both BLE 5 and 4 devices. When I read specs, I see that BLE 5 is backward compatible as well. What about on device side? If I develop new device with any BLE 5 module, Can I connect it to using a BLE4 supported mobile phone? If not, is there any module that support dual mode? I want my device to work with old devices but I also want to benefit from the BLE5 advantages with BLE5 devices.
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蓝牙版本完全向后兼容所有合格的设备，因此通常任何新设备都将使用“旧”协议与旧设备通信。
蓝牙的理念是，新的规范版本总是会增加功能，并且很少会从旧的规范版本中删除功能。
因此，在您的示例中，是的，5.0 模块将保留所有 4.x 功能。5.0 设备是用于所有意图和目的的 4.x 设备。
当涉及可选功能时，会出现一个明显但罕见的例外情况，但这似乎不是您的情况。假设在 4.x 和 5.0 中都有一个可选功能 X。如果设备 A 是 4.x 设备并且实现了 X，如果设备 B 是 5.0 设备但没有实现 X，那么显然 A 和 B 不能一起使用 X。
另请注意，“双模式”是指设备同时实现经典蓝牙和低功耗蓝牙，与版本关系不大。
于 2018-10-22T14:25:50.143 回答