# \#tcp **URL:** https://forums.digi.com/tag/tcp/64.md [Latest](https://forums.digi.com/latest.md) · [Categories](https://forums.digi.com/categories.md) · [Tags](https://forums.digi.com/tags.md) --- ## [RCM4300 and nb of TCP connections](https://forums.digi.com/t/rcm4300-and-nb-of-tcp-connections/29920)
**Author:** [@fabrice](https://forums.digi.com/u/fabrice)\ **Replies:** 2\ **Last updated:** [April 2, 2024, 2:13pm UTC](https://forums.digi.com/t/rcm4300-and-nb-of-tcp-connections/29920 "2024-04-02T14:13:05Z")
Hello, I have a small technical question on TCP connection: My setup is the following : RCM4300 Dynamic C 10.72E. I’m using a TCP connection on TCP\_PORT 23. Today, I can only connect in tcp mode (e.g. telnet) in a … --- ## [How can I restart the TCP/IP service without having to reboot the RCM6760 ?](https://forums.digi.com/t/how-can-i-restart-the-tcp-ip-service-without-having-to-reboot-the-rcm6760/21830)
**Author:** [@sshamali](https://forums.digi.com/u/sshamali)\ **Replies:** 1\ **Last updated:** [October 1, 2020, 11:21am UTC](https://forums.digi.com/t/how-can-i-restart-the-tcp-ip-service-without-having-to-reboot-the-rcm6760/21830 "2020-10-01T11:21:50Z")
I´m having problems loosing my TCP/IP connection, would like to restart the TCP/IP service without having to reboot the module. I´m using RCM6760 and DC 10.72 --- ## [XBee3 LTE-M/NB-IoT Unable to make incoming TCP connections after waking from cyclic sleep](https://forums.digi.com/t/xbee3-lte-m-nb-iot-unable-to-make-incoming-tcp-connections-after-waking-from-cyclic-sleep/21740)
**Author:** [@DonaldB](https://forums.digi.com/u/DonaldB)\ **Replies:** 11\ **Last updated:** [September 11, 2020, 9:42am UTC](https://forums.digi.com/t/xbee3-lte-m-nb-iot-unable-to-make-incoming-tcp-connections-after-waking-from-cyclic-sleep/21740 "2020-09-11T09:42:35Z")
I am currently evaluating the XBee3 Cellular LTE-M/NB-IoT for use in one of our products. I have been experimenting with cyclic sleep mode and incoming TCP connections and I believe that I have found a bug. Here is wha… --- ## [XBee3 LTE-M/NB-IoT Listener socket closed shortly after creating listener socket](https://forums.digi.com/t/xbee3-lte-m-nb-iot-listener-socket-closed-shortly-after-creating-listener-socket/21742)
**Author:** [@DonaldB](https://forums.digi.com/u/DonaldB)\ **Replies:** 6\ **Last updated:** [September 10, 2020, 10:33am UTC](https://forums.digi.com/t/xbee3-lte-m-nb-iot-listener-socket-closed-shortly-after-creating-listener-socket/21742 "2020-09-10T10:33:17Z")
I have been testing the XBee3 LTE-M/NB-IoT with incoming TCP connections and I have been seeing some strange behaviour when using extended socket frames. I create a socket using the Socket Create frame and then set it t… --- ## [Rabbit TCP client](https://forums.digi.com/t/rabbit-tcp-client/21693)
**Author:** [@JPal](https://forums.digi.com/u/JPal)\ **Replies:** 2\ **Last updated:** [September 2, 2020, 10:58am UTC](https://forums.digi.com/t/rabbit-tcp-client/21693 "2020-09-02T10:58:06Z")
Hello, I would like etablish a connection between a server on my VM and my card. Currently, I have a connection between my VM and my card (BL4S100) but only with my VM as client and my card as server. I have a server on … --- ## [Micropython - TCP Header - Maximum Segment Size - MSS](https://forums.digi.com/t/micropython-tcp-header-maximum-segment-size-mss/21411)
**Author:** [@gopinaath](https://forums.digi.com/u/gopinaath)\ **Replies:** 0\ **Last updated:** [May 28, 2020, 9:39am UTC](https://forums.digi.com/t/micropython-tcp-header-maximum-segment-size-mss/21411 "2020-05-28T09:39:40Z")
Trying to communicate using MQTT using Micropython on Xbee3 Cellular Modem. It appears that Micropython’s usocket library sends with TCP Header Option- Maximum Segment Size(MSS) that is very low (less than 50). Such lo… --- ## [How to use SSL with the digi.xbee.xsocket module?](https://forums.digi.com/t/how-to-use-ssl-with-the-digi-xbee-xsocket-module/21348)
**Author:** [@cory.schooley](https://forums.digi.com/u/cory.schooley)\ **Replies:** 4\ **Last updated:** [May 11, 2020, 3:29pm UTC](https://forums.digi.com/t/how-to-use-ssl-with-the-digi-xbee-xsocket-module/21348 "2020-05-11T15:29:38Z")
TL;DR: I am following the example at https://github.com/digidotcom/xbee-python/blob/master/examples/communication/socket/SocketTCPClientSample/SocketTCPClientSample.py to POST data to our server but cannot figure out how… --- ## [Can I bridge a TCP Client connect and output thru a TCP Server connection to a remote host via TLS?](https://forums.digi.com/t/can-i-bridge-a-tcp-client-connect-and-output-thru-a-tcp-server-connection-to-a-remote-host-via-tls/20727)
**Author:** [@sjmcdowall](https://forums.digi.com/u/sjmcdowall)\ **Replies:** 0\ **Last updated:** [August 26, 2019, 3:37pm UTC](https://forums.digi.com/t/can-i-bridge-a-tcp-client-connect-and-output-thru-a-tcp-server-connection-to-a-remote-host-via-tls/20727 "2019-08-26T15:37:25Z")
We have both Connect SP devices and TS devices – in either case – here is our desire. We have another Digi TS that, when connected to its port 2101 (for us) it outputs a stream of sensor information (and feeds another d… --- ## [XBee3 LTE-M does not always transfer all data.](https://forums.digi.com/t/xbee3-lte-m-does-not-always-transfer-all-data/19810)
**Author:** [@cvanbrederode](https://forums.digi.com/u/cvanbrederode)\ **Replies:** 5\ **Last updated:** [July 17, 2019, 10:17am UTC](https://forums.digi.com/t/xbee3-lte-m-does-not-always-transfer-all-data/19810 "2019-07-17T10:17:49Z")
I have a XBee3 LTE-M module, mounted on a custom board that is communicating with a Cypress PSoC 5, running FreeRTOS 10.1 I’m trying to download a ~150 KB file (a firmware for OTA updates) using HTTP GET, and sometimes … --- ## [TCP bulk data without PSH flag on each packet](https://forums.digi.com/t/tcp-bulk-data-without-psh-flag-on-each-packet/20423)
**Author:** [@jrmclaugh](https://forums.digi.com/u/jrmclaugh)\ **Replies:** 2\ **Last updated:** [April 25, 2019, 12:36pm UTC](https://forums.digi.com/t/tcp-bulk-data-without-psh-flag-on-each-packet/20423 "2019-04-25T12:36:27Z")
Hello, we have an application that acts as a server responding to client requests. Usually responses are short and easily fit within a single packet. Now we are trying to introduce responses that have to span multiple … --- ## [RCM6700 problem with USB-Ethernet interface](https://forums.digi.com/t/rcm6700-problem-with-usb-ethernet-interface/19989)
**Author:** [@john\_Mc](https://forums.digi.com/u/john_Mc)\ **Replies:** 4\ **Last updated:** [February 11, 2019, 2:37pm UTC](https://forums.digi.com/t/rcm6700-problem-with-usb-ethernet-interface/19989 "2019-02-11T14:37:12Z")
Hello, I have a problem trying to connect with Rabbit RCM6700 using Exar XR22801 through USB connection. Exar XR22801 acts as a bridge with a switch and with a GPS module connected to one UART line, all in one PCB. In p… --- ## [tcp client connection running out of sock\_writable(&socket) space](https://forums.digi.com/t/tcp-client-connection-running-out-of-sock-writable-socket-space/19999)
**Author:** [@pfitze](https://forums.digi.com/u/pfitze)\ **Replies:** 4\ **Last updated:** [November 13, 2018, 4:00pm UTC](https://forums.digi.com/t/tcp-client-connection-running-out-of-sock-writable-socket-space/19999 "2018-11-13T16:00:47Z")
Dynamic C 10.72, Rabbit BL4S160 1M The Rabbit implements a TCP client and sends data packets every 200ms to a server. This works fine for about 10-15 minutes. During this time the sock\_writable(&socket) function retur… --- ## [2 TCP Clients connected to a Connect ME ?](https://forums.digi.com/t/2-tcp-clients-connected-to-a-connect-me/19924)
**Author:** [@rfid](https://forums.digi.com/u/rfid)\ **Replies:** 1\ **Last updated:** [October 5, 2018, 1:51pm UTC](https://forums.digi.com/t/2-tcp-clients-connected-to-a-connect-me/19924 "2018-10-05T13:51:35Z")
Is it possible to connect 2 TCP Clients to a Connect ME if the ME is acting as a TCP server (sockets)? --- ## [TCP direct capture from anywhereUSB device](https://forums.digi.com/t/tcp-direct-capture-from-anywhereusb-device/19457)
**Author:** [@plasmaphase](https://forums.digi.com/u/plasmaphase)\ **Replies:** 1\ **Last updated:** [May 14, 2018, 5:21pm UTC](https://forums.digi.com/t/tcp-direct-capture-from-anywhereusb-device/19457 "2018-05-14T17:21:52Z")
I would like to, instead of obtaining data via an emulated com port, capture the TCP/IP traffic (preferrably via python) directly. I’m assuming this device uses a socket per physical port, I just don’t know if there’s a… --- ## [sending TCP/IP data to a remote device attached to Connect ME](https://forums.digi.com/t/sending-tcp-ip-data-to-a-remote-device-attached-to-connect-me/13325)
**Author:** [@Marti](https://forums.digi.com/u/Marti)\ **Replies:** 3\ **Last updated:** [April 23, 2018, 7:15pm UTC](https://forums.digi.com/t/sending-tcp-ip-data-to-a-remote-device-attached-to-connect-me/13325 "2018-04-23T19:15:38Z")
Hello: I have an embedded board with Ethernet connection that has to communicate with a remote RS232 device attached to a Connect ME device. That is, the serial data must be encapsulated in a TCP/IP frame by the CPU, se… --- ## [Can i program a RCM6700 on RCM5700 interface board?](https://forums.digi.com/t/can-i-program-a-rcm6700-on-rcm5700-interface-board/19274)
**Author:** [@antz24](https://forums.digi.com/u/antz24)\ **Replies:** 2\ **Last updated:** [March 6, 2018, 4:38pm UTC](https://forums.digi.com/t/can-i-program-a-rcm6700-on-rcm5700-interface-board/19274 "2018-03-06T16:38:31Z")
I am trying to port some code from a RCM5750 to a RCM6750 rabbit module but for some odd reason i am not getting the same functionality. The code complies correctly but the TCP/IP link light stays active at all times. I … --- ## [Converting TCP to RTU](https://forums.digi.com/t/converting-tcp-to-rtu/18481)
**Author:** [@cis9391](https://forums.digi.com/u/cis9391)\ **Replies:** 1\ **Last updated:** [January 24, 2018, 2:09pm UTC](https://forums.digi.com/t/converting-tcp-to-rtu/18481 "2018-01-24T14:09:52Z")
Is it possible to configure a Digi One IA to convert modbus TCP(Slave) to modbus RTU(Master)? I have successfully configure the One IA to convert modbus RTU(Slave) to modbus TCP(Master) but not the other way around. Any … --- ## [HTTP library, blocked incoming requests in RCM67xx](https://forums.digi.com/t/http-library-blocked-incoming-requests-in-rcm67xx/18908)
**Author:** [@luissilva](https://forums.digi.com/u/luissilva)\ **Replies:** 1\ **Last updated:** [November 14, 2017, 2:21pm UTC](https://forums.digi.com/t/http-library-blocked-incoming-requests-in-rcm67xx/18908 "2017-11-14T14:21:55Z")
I found what I think is a problem with the HTTP library and I can not find a solution. I use: DynamicC10.72C (But the problem happens with all versions) RCM6760 Description: I use the “\\Samples cpip\\http\\CGI.C” … --- ## [How is TCP flow control handled on XBee Cellular (API mode)?](https://forums.digi.com/t/how-is-tcp-flow-control-handled-on-xbee-cellular-api-mode/18218)
**Author:** [@jas](https://forums.digi.com/u/jas)\ **Replies:** 4\ **Last updated:** [October 11, 2017, 4:07pm UTC](https://forums.digi.com/t/how-is-tcp-flow-control-handled-on-xbee-cellular-api-mode/18218 "2017-10-11T16:07:10Z")
Does a xmit response indicate local packet send or remote ack? Is there any way to affect TCP window size/buffering to avoid dropping incoming packets due to a slow, low-RAM host processor? How much buffering can XBee … --- ## [XBee Cellular connection issue (CI reading 0x024)](https://forums.digi.com/t/xbee-cellular-connection-issue-ci-reading-0x024/18718)
**Author:** [@bcbbc](https://forums.digi.com/u/bcbbc)\ **Replies:** 11\ **Last updated:** [September 15, 2017, 3:19pm UTC](https://forums.digi.com/t/xbee-cellular-connection-issue-ci-reading-0x024/18718 "2017-09-15T15:19:05Z")
Hi, I’m trying to set 2 XBee Cellular LTE CAT 1 modules with static IP address to talk to each other. I set following parameters DL(Destination Address) to each other’s IP address. DE(Destination Port) matches to the… --- ## [Can two Xbee Cellular LTE CAT 1 TCP connect with each other?](https://forums.digi.com/t/can-two-xbee-cellular-lte-cat-1-tcp-connect-with-each-other/18488)
**Author:** [@bcbbc](https://forums.digi.com/u/bcbbc)\ **Replies:** 1\ **Last updated:** [June 30, 2017, 9:26am UTC](https://forums.digi.com/t/can-two-xbee-cellular-lte-cat-1-tcp-connect-with-each-other/18488 "2017-06-30T09:26:08Z")
I have two xbee cellular LTE CAT 1 dev boards now. So can I send messages between those two boards by TCP connection? what register I need to set? I tried to set Destination IP Address, Destination Port and Listening Sou… --- ## [MODbust TCP master](https://forums.digi.com/t/modbust-tcp-master/18450)
**Author:** [@Demolick](https://forums.digi.com/u/Demolick)\ **Replies:** 4\ **Last updated:** [June 19, 2017, 9:00am UTC](https://forums.digi.com/t/modbust-tcp-master/18450 "2017-06-19T09:00:18Z")
I have tried to implemented MODbust master on TCP on RCM 6700. Havig really hard time with “int MBM\_Send\_ADU ( \*ADUaddress, ADUlength );” Any samples? --- ## [On XBee Cellular in API mode how do I tell if remote end closed TCP connection?](https://forums.digi.com/t/on-xbee-cellular-in-api-mode-how-do-i-tell-if-remote-end-closed-tcp-connection/18428)
**Author:** [@jas](https://forums.digi.com/u/jas)\ **Replies:** 3\ **Last updated:** [June 13, 2017, 11:13am UTC](https://forums.digi.com/t/on-xbee-cellular-in-api-mode-how-do-i-tell-if-remote-end-closed-tcp-connection/18428 "2017-06-13T11:13:06Z")
On XBee Cellular in API mode how do I tell if remote side closed TCP connection? It seems like the last thing I get is an RX packet. --- ## [S6B Association Indication](https://forums.digi.com/t/s6b-association-indication/17924)
**Author:** [@emonk](https://forums.digi.com/u/emonk)\ **Replies:** 1\ **Last updated:** [January 20, 2017, 2:23pm UTC](https://forums.digi.com/t/s6b-association-indication/17924 "2017-01-20T14:23:52Z")
I’m new to TCP talk, please let me know if this inquiry doesn’t make sense… I’m using an S6B WiFi module as an IBSS creator in Soft AP mode and Transparent mode with TCP. I can connect to it just fine with an Ipad or P… --- ## [sock\_close(): Time to fully close socket?](https://forums.digi.com/t/sock-close-time-to-fully-close-socket/17759)
**Author:** [@casey](https://forums.digi.com/u/casey)\ **Replies:** 1\ **Last updated:** [January 5, 2017, 2:58am UTC](https://forums.digi.com/t/sock-close-time-to-fully-close-socket/17759 "2017-01-05T02:58:54Z")
I’m using an RCM6600W with code which calls tcp\_tick() just about once every 80ms. If I establish a connection, receive a small amount of data, wait 15 seconds, and then call sock\_close, I’ve found that waiting up to 30… --- ## [sock\_close(): Time to fully close socket?](https://forums.digi.com/t/sock-close-time-to-fully-close-socket/17760)
**Author:** [@casey](https://forums.digi.com/u/casey)\ **Replies:** 1\ **Last updated:** [December 1, 2016, 11:04am UTC](https://forums.digi.com/t/sock-close-time-to-fully-close-socket/17760 "2016-12-01T11:04:46Z")
I’m using an RCM6600W with code which calls tcp\_tick() just about once every 80ms. If I establish a connection, receive a small amount of data, wait 15 seconds, and then call sock\_close, I’ve found that waiting up to 30… --- ## [XBee Wi-Fi S6B ignores tcp SYN packet after the 5th connection](https://forums.digi.com/t/xbee-wi-fi-s6b-ignores-tcp-syn-packet-after-the-5th-connection/16806)
**Author:** [@Loryn\_Brendes](https://forums.digi.com/u/Loryn_Brendes)\ **Replies:** 3\ **Last updated:** [November 21, 2016, 11:44am UTC](https://forums.digi.com/t/xbee-wi-fi-s6b-ignores-tcp-syn-packet-after-the-5th-connection/16806 "2016-11-21T11:44:51Z")
We are using XBee module as a web Server and is working well. (XBee is connected via UART to ARM microcontroller) Problem is: Every 1500 milliseconds a get request is send to Xbee module and Xbee Response is ok. But af… --- ## [TCP Modbus on Connect Port X2](https://forums.digi.com/t/tcp-modbus-on-connect-port-x2/17420)
**Author:** [@vagdevi\_varanasi](https://forums.digi.com/u/vagdevi_varanasi)\ **Replies:** 1\ **Last updated:** [September 20, 2016, 10:01am UTC](https://forums.digi.com/t/tcp-modbus-on-connect-port-x2/17420 "2016-09-20T10:01:12Z")
I have tried to find an answer to this but the page always takes me to X4 and the models are not the same. So the question is “Will Connect Port X2 PN (1P)50001527-29S support modbus”. Do i need to run the python file t… --- ## [What is the meaning of TCP Server Socket Timeout parameter](https://forums.digi.com/t/what-is-the-meaning-of-tcp-server-socket-timeout-parameter/16169)
**Author:** [@jcalderon](https://forums.digi.com/u/jcalderon)\ **Replies:** 1\ **Last updated:** [January 29, 2016, 1:06pm UTC](https://forums.digi.com/t/what-is-the-meaning-of-tcp-server-socket-timeout-parameter/16169 "2016-01-29T13:06:04Z")
On xbee WiFi there is a parameter called TCP Server Socket Timeout. I suppose that if a TCP socket connection is initiated by the client, then is no message is received after timeout the socket is closed, am I right?. --- ## [XBee issue when TCP Retransmission (packet lost) because 2100 octets (2083) in Xbee buffer maximum](https://forums.digi.com/t/xbee-issue-when-tcp-retransmission-packet-lost-because-2100-octets-2083-in-xbee-buffer-maximum/15780)
**Author:** [@Pascal](https://forums.digi.com/u/Pascal)\ **Replies:** 1\ **Last updated:** [November 30, 2015, 1:19pm UTC](https://forums.digi.com/t/xbee-issue-when-tcp-retransmission-packet-lost-because-2100-octets-2083-in-xbee-buffer-maximum/15780 "2015-11-30T13:19:20Z")
Hello, I have an issue with the XBee Wifi. When I send a flow of data permanently, I have sometimes a TCP Retransmission. When I have a Fast TCP Retransmission all data are transmitted. But, when I have a TCP Retrans… [Next page](https://forums.digi.com/tag/tcp/64.md?match_all_tags=true&page=1&tags%5B%5D=tcp)