I am receiving a CME Error 923 from a RC7620 modem without a clear indication of any issue: Tx: AT+COPS? Rx: +COPS: 0,0,“Optus AU IoT eSim”,2 Rx: OK Tx: AT+KTCPCFG=1,0,“a valid internet address”,10113 Rx: +KTCPCFG: 1 Rx: OK Tx: AT+KTCPCNX=1 Rx: OK Rx: +KCNX_IND: 1,4,1 Rx: +KCNX_IND: 1,1,0 …

didn’t you need to wait for the “+KTCP_IND: 1,1”? [image] RC7620 TCP connection problem RC76 no problem is found: ati3 Manufacturer: Sierra Wireless, Incorporated Model: RC7620-1 Revision: SWI9X07H_00.08.07.00 …

Where is this documented? The documentation states: Notification format: • For = 0 or 1: +KCNX_IND: < cnx_cnf >,< status >,< af > The indicator is supposed to have 3 parts? So can I assume the socket is not connected until “+KCNX_IND=1,1” is received?

I guess +KCNX_IND is for IP layer for TCP layer, you need to wait for +KTCP_IND

OK thanks. Is there a whitepaper or application note describing the correct sequence of AT commands to bring up a TCP connection?

In HL78xx AT command guide, there is some example in Appendix section, i think you can regard that part as reference HL78xx AT Commands Interface Guide This document describes the AT command set used with the HL78xx series of embedded modules. Of course for…

I’m also seeing CME ERROR: 923 from time to time. Our RC76xx application loops sending a single UDP packet about once every two minutes. sometimes after hundreds of successful iterations we suddenly see CME ERROR: 923 in response to our KUDPSND command - we are expecting to see “CONNECT”, after w…

if you restart the UDP session, is it able to send UDP data?

‘Restart the UDP session’ - what would one do to achieve that? Just issue another KUDPSND? Or delete then re configure with UDPCFG? Or use KCNXDOWn and bring that back up? This is what I’m trying to find out - what the appropriate error recovery should be. There are so many levels involved, and…

I am thinking if any of the following can be workaround: Just issue another KUDPSND? Or delete then re configure with UDPCFG? Or use KCNXDOWn and bring that back up?

My advice is: don’t attempt any ‘smart’ recovery, just tear the whole session down and rebuild it from scratch. Any other strategy will result in frustration and many lost hours. Ignore the documentation, don’t try and guess what any error codes might mean, at the first hint of any deviation from th…

RC76 CME Error 923

IoT Modules Legacy HL Series

jyijyi August 9, 2023, 7:01am 2

didn’t you need to wait for the “+KTCP_IND: 1,1”?

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RC76 CME Error 923

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