@Edward9284 said in Interpreting a 4G LTE module output, $QCNETDEVCTL: 0/1:

SIM7670G 4G LTE

Hi,
SIMCOM SIM7670G LTE cat1bis - Qualcomm QCX216 chipset

$QCNETDEVCTL is a Qualcomm command

Taking at-cmd manual from e.g. cavli C16QS module (same chipset) - see below.

These URCs display the state:
0 Bind cid for LWIP failure
1 Bind cid for LWIP success

Check the setting: AT$QCNETDEVCTL?

This will not solve your connectivity issue…but explains the URC.

BR, M.

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AT$QCNETDEVCTL
Description
The command set data path control for the network adapter. Control data path open by setting <op> to bind LWIP to PDN context with <cid> . Control data path close by setting <op> to unbid LWIP to PDN context with <cid>.
Syntax

AT$QCNETDEVCTL=<op>,<cid>,{,<urc_en>}
AT$QCNETDEVCTL?
AT$QCNETDEVCTL=?
–> $QCNETDEVCTL : (list of supported (<op>,<cid,<urc_en>)s)

<op>
Specifies device control option
0 Unbind cid for LWIP
1 Bind cid for LWIP once and no rebind if re-activate PDN context with same cid after deactivation
2 Bind cid for LWIP and rebind if re-activate PDN context with the same cid after deactivation
3 Auto dial and bind cid when power on, saved in NVM after power down

<cid>
Specifies a Particular non secondary PDP context definition. <cid> values of 1-15 are supported.

<urc_en>
specifies whether report URC $QCNETDEVCTL : <state> 0 Disable URC $QCNETDEVCTL : <state> 1 Enable URC $QCNETDEVCTL: <state>

<state>
0 Bind cid for LWIP failure
1 Bind cid for LWIP success

Note:
If the <cid> for PDN context defined but deactivated , bind this <cid> will auto activate PDN context. If the <cid> for PDN context undefined, bind this <cid> will cause activation failed.

Unlike the SIM800L I have experience with, a SIM7670G core board I’m testing stops responding to commands via UART and to incoming SMS messages after operating perfectly for a few hours, and definitely overnight. The odd thing is, when the SIM7670G core board is connected by USB to a PC(and monitored in Putty or without Putty running) during multi-day tests, it does not fail.

4GLTEcb.jpg

This is not occurring with a SIM7600NA core board I’m also testing, it maintains a persistent connection to the 4G LTE network and never fails.

Both boards are being tested with 9VDC 3 amp power adapters, with a 470uf cap in parallel.

Why might this SIM7670G board need the USB connected to a power source? Not getting any specific support from the supplier.

Could it just be a defective board?
Has anyone else experienced this?