gsm

Communicating between two smartphones without using a Cellular Tower - Peer to Peer

由 最后都变了- 提交于 2019-12-23 18:48:07
问题 Lets say I have 2 mobile phones which are 50 meters away from each other and I would like to send a very small packet of data from mobile-A to mobile-B, without using any communication to cellular tower. To make it simpler, I would like to build an app which implements a Peer to Peer connection for 2 mobiles in the same radius (in the same area). Is this feasible using the technology of smartphones these days? (Android for example) 回答1: No. The radio services the mobile networks are licensed

SIM900 GSM/GPRS not getting a proper AT+CREG? answer

由 无人久伴 提交于 2019-12-23 18:42:31
问题 I'm using an Arduino UNO with attached IComsat SIM900 GSM/GPRS shield. Using the following tutorial: Arduino Live GPS Tracker I'm stuck with the AT+CREG? command, which checks if the SIM-card is registered at the provider. The following logic is used: In the GSM_HTTP.INO file within the "void setup()" function, the following line gets executed modem.checkNetwork(); void setup() { Serial.begin(9600); Serial.println("GM862 monitor"); modem.switchOn(); // switch the modem on delay(4000); // wait

Is telephony manager values reliable and changeable (cdma)?

由 Deadly 提交于 2019-12-23 17:21:46
问题 I want to know if I can rely on the telephony values like country, MCC, etc on Android for my app. Can I change them on the run using setprop? I tried changing using setprop it didn't seem to work. From my understanding telephony manager is a class/interface which represents Hardware configuration of GSM or CDMA. In case of GSM this could be sim and in case of CDMA it cud be a hardware. My questions are: Who update these values in both the cases for the first time? Are these values are saved

how to get a list of available gsm networks?

由 痞子三分冷 提交于 2019-12-23 13:03:38
问题 i'm currently writing on some piece of code in android 2.1 that is supposed to measure the signal strength of the gsm signals. what i need is some kind of list with some kind of network IDs matching the corresponding signal strengthes... i got this far: public class main extends Activity { TelephonyManager telManager; GSMListener gsmListener; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); gsmListener = new

GPS车辆监控调度系统解决方案

由 天大地大妈咪最大 提交于 2019-12-23 10:32:33
一、系统介绍（ b2b电子商务网 ） 随着科学技术的飞速发展，GPS（全球卫星定位系统）技术用于地面移动目标的跟踪定位已被广泛应用。特别是美国取消了SA限制后，其定位精度和可靠性有 了很大的提高。作为GPS跟踪定位与远程监控的信息传输手段，无线通讯技术是实现其功能的关键。GSM（全球公众数字移动网）的普及为GPS技术的广泛应用 提供了可靠保障，特别是利用GSM网络提供的短消息服务（SMS）使信息传输更加方便快捷，使GPS系统的运行费用大幅度下降。因此可以说GPS已进入了实用性普及阶段。另一方面随着计算机软件技术的发展，大量数据处理专用软件的开发，促进了地图矢量化、地理数据建库等地理信息技术的发展。作为GPS应用的 载体GIS（地理信息系统）技术以其准确而可靠的数据、多样化的信息输出，开拓出广泛的应用空间。尤其是在智能交通领域，通过GPS、无线通信、GIS技术 的有机结合，为车辆监控、交通控制的智能化提供了大量的解决方案。 本系统利用各种无线通信网做为通信媒介，利用GPS定位技术及其计算机技术等手段，结合运用矢量化地理信息电子地图软件平台，实现对车辆的精确定位、 报警求助、信息服务、防盗报警、中文短消息收发,部分遥控操作及车辆工作状态监察的功能。 系统大体由监控中心、车载设备、无线通信系统三部分组成，无线通信系统由于是利用各种已建成的无线通讯网，不在设计之列

Send SMS via Nokia Mobile Using AT Commands

由 Deadly 提交于 2019-12-23 05:25:56
问题 I'm trying to send sms with my Nokia cell phone (C1-01) using AT Commands and I can successfully send SMS with this vb.net code. Button_Send_Click: Dim SMSPort = New SerialPort With SMSPort .PortName = "COM2" .BaudRate = 9600 .Parity = Parity.None .DataBits = 8 .StopBits = StopBits.One .Handshake = Handshake.None .DtrEnable = True .RtsEnable = True .NewLine = vbCrLf End With SMSPort.Open() SMSPort.Write("AT+CMGF=1" & vbCrLf) Threading.Thread.Sleep(200) SMSPort.Write("AT+CMGS=" & Chr(34) &

How can I send an MMS via a GSM/GPRS modem connected to a linux computer? [closed]

由 拥有回忆 提交于 2019-12-23 02:58:18
问题 It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center. Closed 6 years ago . I have a directory which contain say 50 image files (.jpg) each less than 300kb. This files should be attached as MMS and send from Linux computer using GSM/GPRS modem. I need to work out how to package a MMS and

Concatenated SMS extended symbols at segments border - what is correct split method?

由 烈酒焚心 提交于 2019-12-22 12:17:30
问题 For concatenated SMS messages (in GSM encoding), if extended table symbol (one of these: }{[]|~^\€) is placed at the end of segment, what is correct way to split such message: Leave first byte of symbol (0b) at the end of segment and put second byte to the beginning of next one, and so fill all available bytes of UD (which seems logically correct) OR Move whole symbol bytes to the next segment and leave unused byte at the end? I didn't found any clarification neither in SMPP 3.4 specs or

GEO基因芯片数据处理精华（一）：GEOquery包

由 五迷三道 提交于 2019-12-22 06:15:39
合作研究请联系QQ 2279055353 GEO( Gene Expression Omnibus )是NCBI(美国国家生物信息中心)下的基因表达数据库，包括各种各样的基因芯片检测技术得到的试验记录与平台信息。GEO是最具知名度的基因表达数据存储数据库，这些数据包括单通道和双通道的微阵列实验，测量对象包括 mRNA , 基因组 cDNA , 蛋白质冗余物，以及各种非阵列技术，例如，高通量测序技术。现在，我们介绍GEO数据库的检索、下载，以及数据的预处理方法。首先，我们介绍GEO数据集查询R语言包—— GEOquery . GEOquery包的下载与安装 GEOquery包位于生物信息开源软件库 Bioconductor , 在Bioconductor主页的搜索栏输入 GEOquery 回车后，出现了下载项。 按照安装提示在R控制台安装即可。 GEO数据组织结构 GEO上的数据通常有四种组织形式，它们分别是： Platforms Samples Series Datasets 其中，前三种形式由用户提交，第四种数据集的形式由GEO整理汇总。 Platforms 一个 platform 记录描述了阵列上的元素列表，例如，cDNA, 探针，ORFs, 抗体等。每个平台记录有一个唯一的GEO访问符 GPLxxx . 一个平台记录可能包括由多个用户提交的多个样本。 Samples 一个

How to use Uri.parse() with # at the end

由 房东的猫 提交于 2019-12-21 21:42:06
问题 I try to use GSM codes to transfer my calls with an android app. For example, if I call : **21*otherNumber# All my calls will be transfered on otherNumber. My code: Uri transfert = Uri.parse( "tel:**21*" + numero + "#"); Intent intent = new Intent( Intent.ACTION_CALL, transfert ); startActivity(intent); However, Uri.parse() has for definition: " A URI reference includes a URI and a fragment, the component of the URI following a '#' " So, it removes the # but I need it. The GSM code can't
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