uuid

I have following problem: When my headset is turned on before my phone bluetooth is on, it will not connect to my phone. It will only connect to my phone when phone bluetooth is on and my headset is turned on second. I found out that I can still connect to my headset when bluetooth is turned on second (1. case), by going into androids bluetooth menu where my paired devices are listed and select my headset (although my headset is listed as 'connected'). This will connect my headset and my phone too. What I now want to do is to perform the second way of connecting to my headset, when my phone

This question already has an answer here : CoreBluetooth: What is the lifetime of unique UUIDs (1 answer) Closed 5 years ago . I've been playing with Corebluetooth and I've learnt that besides going through the tedious process of scanning for a peripheral every time I want to connect, I can also store the peripheral's UUID and use it with retrievePeripheralsWithIdentifiers and connectPeripheral for further reconnections. Turns out that it only works for a certain amount of time, apparently the peripheral has its UUID updated, therefore the stored one can be considered expired. I haven't been

I read about the UUID v4 and it's virtually unique, and that's what I need. The problem is, it's a too large number, is it possible to generate UUID's like Facebook or Twitter with fewer characters? I read some post, where you can shrink this code to 20 with Ascii85, but don't see a reliable PHP script doing the job. Someone knows a tested class?? for random ID's it the best way to store this 20 char, right? --- Edit --- @David Schwartz Thanks. I need a random unique identifier in a single server, between 8 and 16 chars (ok 20 is fine if its the lowest). The idea it's to identify objets with

一.从test02表中查询每个uid最早登录的前2天 表如下图所示： select * from (select uid,day, @ROW := case when @uuid=uid then @ROW+1 else 1 END rn, @uuid:=uid from (select uid,day from test02 where day between '2019-09-01' and '2019-09-30' order by uid,day) l2, (select @ROW:=0 ,@uuid:=0) l3 ) l4 where rn <=2 运行结果如下图： 简单解释：@ROW:=0 ,@uuid:=0 相当于2个变量 当@uuid=uid时代表为同一用户，@ROW可以理解为行号 用户不同时，@ROW再次为1 注意： 一定要提前做好排序 来源： https://www.cnblogs.com/yezihan/p/11983328.html

How can we create a RFC 4122 complaint UUID (version 1, time-based) with iOS? Here's the man page of the underlying library used by CFUUID and NSUUID . It contains the time based creation function: #include <uuid/uuid.h> uuid_generate_time(uuid_t); It's contained in iOS as well. 来源： https://stackoverflow.com/questions/15501914/time-based-uuid-version-1-on-ios

I have a distributed application that sends and receives data from a specific service on the Internet. When a node receives data, sometimes it needs to validate that that data is correlated with data it or another node previously sent. The value also needs to be unique enough so that I can practically expect never to generate identical values within 24 hours. In the current implementation I have been using a custom header containing a value of uuid.uuid1() . I can easily validate that that value comes from the one single node running by comparing the received uuid to uuid.getnode(), but this

I'm trying to interact with a temperature meter BLE device using Android Studio as IDE and Java as programming language. Using an app on my smartphone I discovered the services that this device exposes during its functioning: there were a lot of generic services/characteristic and one custom service. First of all I tried to read the HEALTH THERMOMETER service (UUID = 00001809-0000-1000-8000-00805F9B34FB) TEMPERATURE MEASUREMENT characteristic (UUID = 00002A1C-0000-1000-8000-00805F9B34FB) [marked as INDICATE] recovering the characteristic from the list of services and accessing to its

One of the reasons, and probably the main one, to use UUID is to avoid having a "centralized" point responsible for creating and assigning ids to resources. That means that, for REST APIs, the clients could (and should) be able to generate, and give the UUID for a certain resource when they POST that specific resource for the first time. That would minimize problems related with successfully posting a resource for the first time but not getting the ID back as response (connectivity problems for example). That can result in a new post for some of the clients, generating duplicated resources. My