First LTE event/connect take some time on my custom board

RE: First LTE event/connect take some time on my custom board

dejans — Mon, 07 Jul 2025 15:34:31 GMT

Hi,

Can you show your complete AT%XCOUNTRYDATA command?
Can you show the ERROR response you get?

Have you tried to use %XBANDLOCK and %PALL?

[quote user="simon884"]If I understand well the link you provide, using lte_lc_power_off() can offer speed connectiona fter the first connection? Should lte_lc_power_off() save in nvm? What happened if I totaly loss power?[/quote]

lte_lc_power_off() is setting the modem to power off state. When modem is powered off, certain AT command configuration and network information is preserved in NVM and available even after reset (more information can be found here). This could decrease connection establishment time after first connection.

Best regards,
Dejan

RE: First LTE event/connect take some time on my custom board

simon884 — Mon, 07 Jul 2025 08:05:14 GMT

I've tried to restric country with AT%XCOUNTRYDATA=208 but I always got ERROR response. before sending AT%XCOUNTRYDATA I've send AT+CFUN=0

RE: First LTE event/connect take some time on my custom board

simon884 — Fri, 04 Jul 2025 12:38:44 GMT

Ok and you don't find it strange that it's always the same time, give or take a few seconds? Whatever the indoor outdoor exposure rain or shine? Is it normal depending on my configuration that it is always 3 minutes 30 ?

For example if I did AT+COPS? my boards return directly available networks, so if my antenna is so bad and if network search take times, why send this AT command works directly ?

If I understand well the link you provide, using lte_lc_power_off() can offer speed connectiona fter the first connection? Should lte_lc_power_off() save in nvm? What happened if I totaly loss power?

RE: First LTE event/connect take some time on my custom board

dejans — Fri, 04 Jul 2025 12:28:46 GMT

Hi,

Initial network search takes time. Maybe you can consider locking bands/PLMN. You can find similar problem described in this discussion.

Best regards,
Dejan

RE: First LTE event/connect take some time on my custom board

simon884 — Thu, 03 Jul 2025 15:27:07 GMT

here is my antenna: https://www.mouser.fr/ProductDetail/TE-Connectivity-Linx-Technologies/ANT-LPC-FPC-100?qs=OTrKUuiFdkZAr4qk8G4dFg%3D%3D

Maybe it's the antenna, but why first LTE event ALWAYS occurs between 3min and half and 3min40

RE: First LTE event/connect take some time on my custom board

ketiljo — Thu, 03 Jul 2025 15:14:19 GMT

How do the board look like? What kind of antenna are you using? Long connection time can indicate an antenna problem.