gprs | 易学教程

Android Peer-to-Peer Connection

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问题 I need to make a peer-to-peer connection between two android phones running i-jetty web server through gprs channel.But many mobile operators block the inbound connections to the phones.Is there any way around it? 回答1: NAT penetration is complex enough that you really shouldn't mess with it until you're quite familiar with the internals of networking. The autonomous NAT traversal used by pwnat is pretty much the state of the art these days. The basic idea is to use the fact that a router

GPS GPRS, how to receive and process live data

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问题 I have a GPS with a GPRS with an active SIM card. How do I go about directing the GPRS data to a specific website (IP port_ I believe port 3500 is used). I do not know how to acquire the GPS/GPRS data transmission and do not know how (or what should be done) to process the incoming data. I am not familiar with the route the GPRS data goes and how to acquire and process it. I assume it would need HTML/XML. I would like to process in real time. Also what format would a GPS normally send data?

无线相关术语

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802.11 802.11是IEEE最初制定的一个无线局域网标准，主要用于解决办公室局域网和校园网中用户与用户终端的无线接入，业务主要限于数据存取，速率最高只能达到2Mbps。由于它在速率和传输距离上都不能满足人们的需要，因此，IEEE小组又相继推出了802.11b和802.11a两个新标准，前者已经成为目前的主流标准，而后者也被很多厂商看好。 802.11b 802.11b采用2.4GHz直接序列扩频，最大数据传输速率为11Mb/s，无须直线传播。动态速率转换当射频情况变差时，可将数据传输速率降低为5.5Mb/s、2Mb/s和1Mb/s。使用范围支持的范围是在室外为300米，在办公环境中最长为100米。802.11b使用与以太网类似的连接协议和数据包确认，来提供可靠的数据传送和网络带宽的有效使用。 802.11a 802.11a标准是已在办公室、家庭、宾馆、机场等众多场合得到广泛应用的802.11b无线联网标准的后续标准。它工作在5GHzU-NII频带，物理层速率可达54Mb/s，传输层可达25Mbps。可提供25Mbps的无线ATM接口和10Mbps的以太网无线帧结构接口，以及TDD/TDMA的空中接口；支持语音、数据、图像业务；一个扇区可接入多个用户，每个用户可带多个用户终端。现在一些厂商对于该标准的计划已提到议事日程。例如

SIM5320e HTTPS Stack, can't make successful GET request

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问题 I'm currently using a SIM5320e 3G development board with CoolTerm and a PL203 serial to USB connector. The aim is once I can make a successful HTTP/HTTPS GET request I can then incorporate it into a micro-controller project that will transmit data from a remote sensor to the internet vis EDGE/GPRS/3G. However my issue is I have yet to make a successful GET request. I have searched the internet and this site and there is not a vast amount of info on this board, besides the data sheet, which is

SIM5320e HTTPS Stack, can't make successful GET request

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How to send SMS with GSM Click Modem?

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问题 I can finally make a phone call, receive, and answer it. But if I try to send an SMS I receive CMS ERROR: 500 . The GSM modem I am using is Telit GL865-Quad module. Since the Call function is working, what's preventing the SMS to work? please enlightenment me. The Sim Card works fine on my phone to rule out some of the problems. I am using a hyperterminal to type the commands at 19200 speed. This is the user guide with commands for your own convenience. To send an SMS: AT+CMGF=1 // Select

Why does TCP connection keep closing while connecting to xively from Adruino GPRS with AT commands?

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问题 I'm trying to send data from a cellular-connected arduino temperature sensor to xively.com using AT commands. I can open the TCP connection, but then it immediately closes. Why does the TCP connection keep closing? setup: arduino uno mackbook seeedstudio gprs v2.0 att gophone sim card Here is my Terminal readout: Call Ready AT OK AT+CPIN? +CPIN: READY OK AT+CGATT? +CGATT: 1 OK AT+CIPSHUT SHUT OK AT+CIPSTATUS OK STATE: IP INITIAL AT+CIPMUX=0 OK AT+CSTT="wap.cingular" OK AT+CIICR OK AT+CIFSR 10

Huawei Mobile Connect E170

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问题 I am trying to receive SMS messages with a Huawei Mobile Connect, Model: E170 device through hyper terminal but can't. I used the below commands to initialize the modem: AT+CMGF=1 AT+CNMI=2,2,0,0,0 (But this gives me this error: +CMS ERROR: 303) This same commands working on my nokia N70, 6630 and many other nokia models i can't remember. I know the modem can receive and send SMS messages, but how do i do it? 回答1: Below worked for me in Huawe E153. at+cmgf=1 //Set text format at+csmp=49,167 /

中国移动短信营业厅代码大全

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今天突然想查查手机套餐剩余流量及余额，但又不想呼叫10086，按那些提示一下一下的操作很是烦人，于是上网找了下，发现了以下内容，对有这方面需要的朋友提供些帮助。发送CXBX到10086，查询当月套餐剩余短信条数。发送CXGFX到10086，查询当月飞信GPRS套餐剩余流量。发送CXGTC到10086，查询当月GPRS套餐剩余流量。发送CXCCT到10086，查询当月超级畅听套餐剩余流量。发送CXGLL到10086，查询当月已使用的GPRS流量总和。发送CXDX120，查询当月可选计划“短信120”剩余短信条数。发送CXDX500，查询当月可选计划“短信500”剩余短信条数。发送CXCXB，查询当月可选计划“彩信包”剩余彩信条数。发送CXIP1000，查询当月可选计划“IP1000”剩余通话时长。发送CXMDX，查询M计划兑换的“短信包(50条/月)”当月剩余短信条数。发送CXMCX，查询M计划兑换的“彩信包(10条/月)”当月剩余彩信条数。发送CXMG，查询M计划兑换的“10M/月的GPRS流量”剩余流量。信指令　　短信发送端口　　办理业务 YE/CXYE 　　10086 　　　　　余额查询 KTFX 　　　 10086 　　　　开通飞信 QXFX 　　　 10086 　　　　取消飞信 BLHZ 　　　 10086 　　　　开通短信回执 QXHZ 　　　

Does TLS version have a relationship with cellular communication technology? [closed]

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问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 2 years ago . I am a user of Telit GE910-QUAD V3 modem (2G). The below table explains the Telit cellular modems and the TLS protocols they support. Product SSLV3 TLSV1.0 TLSV1.1 TLSV1.2 (2G) N/A YES N/A N/A (3G) YES YES YES N/A (4G) YES YES YES YES After seeing this, I doubt whether cellular technology (2G/3G/4G) plays any