# Continuous data transmission **URL:** \ **Category:** Open AT\ **Created:** [November 17, 2005, 7:06pm UTC](https://forum.sierrawireless.com/t/continuous-data-transmission/137 "2005-11-17T19:06:56Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![delene](https://avatars.discourse-cdn.com/v4/letter/d/c5a1d2/32.png) [@delene](https://forum.sierrawireless.com/u/delene)\ **Post date:** [November 17, 2005, 7:06pm UTC](https://forum.sierrawireless.com/t/continuous-data-transmission/137/1 "2005-11-17T19:06:56Z")
I realise that I am probably asking this in the wrong forum but have no clue where the right place would be. I have managed to set up two radios to connect to each other. I would like that once they are connected any incoming data received is transmitted. However I dont want the incoming data to have a command like at+senddata=“hello” inf front, I want to be able send as soon as the hello is typed in. Is this possible, if so please can someone tell me how Many thanks ---
**Author:** ![snoooze](https://avatars.discourse-cdn.com/v4/letter/s/f08c70/32.png) [@snoooze](https://forum.sierrawireless.com/u/snoooze)\ **Post date:** [November 18, 2005, 9:09am UTC](https://forum.sierrawireless.com/t/continuous-data-transmission/137/2 "2005-11-18T09:09:53Z")
Hello, After you’ve succeeded with your connection you need to change the application from “AT-command mode” to “DATA-mode”. In DATA mode, you can receive/transmit whatever characters you want. Take a look at the Flow control API (FCM Service)… In ADL: ```auto adl_fcmSubscribe(...) adl_fcmSwitchV24State(...) adl_fcmSendData(...) ``` /Snoooze ---
**Author:** ![delene](https://avatars.discourse-cdn.com/v4/letter/d/c5a1d2/32.png) [@delene](https://forum.sierrawireless.com/u/delene)\ **Post date:** [November 18, 2005, 4:06pm UTC](https://forum.sierrawireless.com/t/continuous-data-transmission/137/3 "2005-11-18T16:06:15Z")
Thanks for the help I have managed to set up those commands and they work. It appears that the data is being sent but is not being received on the other side. How do I know if I have received this data? Reading through the manual it says that AT+WMFM must be initialised first. Is this so? And if so how do I go about it? I am only using UART1. What is UART2 used for and is it the same as UART1. I have set my application for UART 1 Thanks Delene ---
**Author:** ![jan](https://avatars.discourse-cdn.com/v4/letter/j/ce7236/32.png) [@jan](https://forum.sierrawireless.com/u/jan)\ **Post date:** [November 18, 2005, 6:04pm UTC](https://forum.sierrawireless.com/t/continuous-data-transmission/137/4 "2005-11-18T18:04:32Z")
Hi delene, > [@delene](#): > > I have managed to set up those commands and they work. It appears that the data is being sent but is not being received on the other side. How do I know if I have received this data? What is connected to the other side? Maybe you can send somthing back to acknowlegde the received data? I assume you are not connected to Target Monitor to display Debug Traces, so you probably need to send an SMS with the acknowledge data. > [@delene](#): > > Reading through the manual it says that AT+WMFM must be initialised first. Is this so? And if so how do I go about it? I am only using UART1. UART 1 is enabled by default. So, if you did not disable it before, you will not need to enable it before using the flow functions. Best Regards, Jan ---
**Author:** ![delene](https://avatars.discourse-cdn.com/v4/letter/d/c5a1d2/32.png) [@delene](https://forum.sierrawireless.com/u/delene)\ **Post date:** [November 20, 2005, 8:18am UTC](https://forum.sierrawireless.com/t/continuous-data-transmission/137/5 "2005-11-20T08:18:18Z")
I have got two wavecom modems. I have connected them to the same apn server and have set one of them to be host. This works if I make a command like at+senddata=“hello”, this data is transmitted. I know want the data to be sent continuously without having to use the command at+sendata= “”. The data that I am asking it to send shows up on the modem that sent it. I am using the trace mode thruough with the target monitor but it shows that it never receives the data. What am I doing wrong? ---
**Author:** ![delene](https://avatars.discourse-cdn.com/v4/letter/d/c5a1d2/32.png) [@delene](https://forum.sierrawireless.com/u/delene)\ **Post date:** [November 20, 2005, 3:39pm UTC](https://forum.sierrawireless.com/t/continuous-data-transmission/137/6 "2005-11-20T15:39:51Z")
I thought it would be best if showed what I had done in my code have connected to one modem and opened the socket in listening mode. I have then changed to data mode using the commands UartHandle = adl\_fcmSubscribe(ADL\_FCM\_FLOW\_V24\_UART1, MyCtrlHandler, MyDataHandler) // to subscribe When I receive the event ADL\_FCM\_EVENT\_FLOW\_OPENNED adl\_fcmSwitchV24State(UartHandle, ADL\_FCM\_V24\_STATE\_DATA) // to receive continuous data The other modem I have opened the socket and enabled it to connect to the first modem (AT+OTCP). I have changed from AT mode to data mode using the following commands UartHandle = adl\_fcmSubscribe(ADL\_FCM\_FLOW, V24\_UART1, MyCtrlHandler, MyDataHandler) // to subscribe When I receive the event ADL\_FCM\_EVENT\_FLOW\_OPENNED adl\_fcmSwitchV24State(UartHandle, ADL\_FCM\_V24\_STATE\_DATA) // to receive continuous data When I received the event ADL\_FCM\_EVENT\_v24\_DATA\_MODE I send the command adl\_fcmSendData(UartHandle, “hello”, 5); The event ASL\_FCM\_EVENT\_MEM\_RELEASE is triggered If I program the two modems, the modem that sends out hello then displays hello and not the other modem. It is as if it never receives a call to the MyDataHandler. MyDataHandler is set up as follows bool MyDataHandler(u16 DataLen, u8 \* Data) ---
**Author:** ![jan](https://avatars.discourse-cdn.com/v4/letter/j/ce7236/32.png) [@jan](https://forum.sierrawireless.com/u/jan)\ **Post date:** [November 21, 2005, 7:42am UTC](https://forum.sierrawireless.com/t/continuous-data-transmission/137/7 "2005-11-21T07:42:38Z")
Hi delene, now I am confused… on the modem you do “adl\_fcmSendData(UartHandle, “hello”, 5);” this will be displayed since you send it out to UART1 of this module instead of over the TCP/IP link. Unfortunately, I don’t know the “AT+OTCP” and “at+senddata” commands. I guess they are from an example provided with OpenAT. But to send through a socket, you would need to use the ed\_SendDataExt() command. If you would like to transmit from the UART from one module to the UART to the other module, you probably would need to receive the Data in the fcm data handler first, then send it over TCP/IP with ed\_SendDataExt(). The other module will receive it over the listening socket in the ed\_DataHandler function. You then would output that data to the UART with the adl\_fcmSendData function. Best Regards, Jan ---
**Author:** ![delene](https://avatars.discourse-cdn.com/v4/letter/d/c5a1d2/32.png) [@delene](https://forum.sierrawireless.com/u/delene)\ **Post date:** [November 21, 2005, 9:17am UTC](https://forum.sierrawireless.com/t/continuous-data-transmission/137/8 "2005-11-21T09:17:46Z")
Dont I feel like an idiot!!! Thanks very much Jan That makes much more sense… Dont you rather want to write the user manual. Your explanations are much easier to follow.