gsm

问题 I have bought ZTE MF667 GSM Modem and i am using Hyper Terminal to send AT COMMANDS, i have a problem with USSD e.g : AT+CUSD=1,"*111#",15 (to check balance) but it returns only OK AT+CUSD=1,"*111#" returns only OK I have tested another AT COMMADS which work fine like AT+CMGL="ALL" to read SMS (WORKS) How could i resolve the problem please ? 回答1: First of all USSD messages are fairly similar to SMS in that a message is sent from the mobile device to the operator network. This means when you

问题 I am developing an application that sends a USSD message to a USSD gateway. However, I do not have an account for the carrier owner of the gateway yet. Still, I have some other accounts and I would like to test if my USSD codding is fine. In that sense, is there a standard USSD command I can send and be understandable and answered by any USSD gateway regardless of the operator? If so, which one(s)? 回答1: As you probably know, USSD stands for Unstructured Supplementary Services Data, and the

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 6 years ago . I've been using GSM modems in my projects to send/recieve SMS-s. I have been using built-in serial port communication features of .net to do this by using standard AT commands. Now I have to extend its functionality (like SMSs in PDU mode, more efficient delivery report handling etc). I don't wanna reinvent the

问题 I wrote this code to interface the gsm module, can anyone check the code and give me some propositions ? hex1= '0x1A'; function delay_s(delay) delay = delay or 1 local time_to = os.time() + delay while os.time() < time_to do end end uart.alt(1); uart.setup(0, 9600, 8, uart.PARITY_NONE, uart.STOPBITS_1, 1) uart.write(0,"AT+IPR=9600\n") for j = 1, 10 do uart.write(0, "AT\n") end delay_s(1000) uart.write(0, "AT\n") delay_s(1000) uart.write(0, 'AT+CSCS="GSM"\n') delay_s(1000) uart.write(0, 'AT

问题 I have problem (challenge) with my app. I want to be connected to the "best" GSM or CDMA cell - the closest, with the best signal, etc... As I turned off the cell-phone functions and turned it on back. That is the thing I want to do in my app, because I need to have the most recent informations of location without using GPS or any data. Can I find the way, how to force Android to refind the GSM/CDMA cell? Lot of thanks for all! 回答1: For GSM, the cell you are connected to is decided by the

问题 In my android app, before a call is picked up, I want to just replace the call beeps with an audio file? and once the call is picked up, I would turn off my audio file. Please someone help me out in this issue! P.S: The purpose of this feature is just to replace the annoying call beeps before the receiver on the other end picks up the call. 回答1: This person is playing an audio file during the call, please follow the link, My streaming audio player continues to play during a phone call -

问题 I'm using a python script to send using Serial , a simple AT Command in this case "AT". That normally returns OK , if everything is going well. The problem is that after a few seconds the GSM Modem Will Dump the following. RSSI:19 (yes i know this is the signal strength). It also dumps : BOOT:23243559,0,0,0,77 This is only occurs from time to time and it ONLY Happens in Linux it doesn't happen in Windows. I tested this using the python script and putty in Linux and using Hyperterminal in

问题 I have sim800 module ,i want to control relay from webserver so i need mqtt library and sample code for arduino uno please help to me,What is AT command for publish and subscribe the tag in sim800 using arduino uno 回答1: I think it is very unlikely that your SIM800 module will have an AT command for MQTT. There are a couple of MQTT libraries for Arduino: AdaFruit: https://github.com/adafruit/Adafruit_MQTT_Library PubSubClient by Nick O'Leary: http://pubsubclient.knolleary.net/ Both of these

问题 I'm writing an simulator (for learning purposes) for complete M3UA-SCCP-TCAP-MAP stack (over SCTP). So far M3UA+SCCP stacks are OK. M3UA Based on the RFC 4666 Sept 2006 SCCP Based on the ITU-T Q.711-Q716 TCAP Based on the ITU-T Q.771-Q775 But upon decoding TCAP part I got lost on dialoguePortion. TCAP is asn.1 encoded, so everything is tag+len+data. Wireshark decode it differently than my decoder. Message is:

问题 I am doing a project on OTA programming of Arduino at remote place so I need GSM along with Arduino, so how can we do OTA with gsm for Arduino? 回答1: I assume you're asking how you can remotely control an Arduino with your phone, right? I suggest using Bluetooth for this, as it is build into every phone nowadays. You'll still have to buy a module to allow the Arduio to communicate via bluetooth. An example of such a module is the HTC-06, wich can be bought online for less then $10 and for wich