How to enumerate and Identify options in a CoAP client in BG77 module

IoT Modules LPWA Module
1

Greetings,

I am currently working with a BG77 module and the CoAP protocol alongside a microprocessor.

Is there a way to determine how many and what options are linked to a CoAP client? While it’s straightforward to manually register the options, my question focuses on automating this process using a microcontroller.

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My plan is to have the microcontroller maintain an internal register of every client and each option. However, I need to first determine if there’s an easier way to achieve this using the modem. I have already searched the CoAP application note but couldn’t find any relevant information.

Thanks in advance.

2

So you want an URC report the option state automatically, right?

3

Hello Mikey

There might have been a misunderstanding. What I need is to query the options added to a specific client, including their type (Uri-port, Uri-Path, etc.), their respective values, and their indices.

For instance, there have been cases where the microcontroller attempts to add a new option (depending on its logic), but it is already added, resulting in an error.

As I mentioned in the last post, I can save all these details in the microcontroller’s logic as classes, but I would like to rule out if there is a simpler method implemented in the modem.

In parallel, according to the CoAP manual, there is a command that allows us to preset options, which is AT+QCOAPOPTIOIN, but it does not work on my BG77 where the FW version is BG77LAR02A04_01.204.01.204

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Here is an example log:

[2025-02-24 10:28:42:175_S:] // ########## Configure Sesion ##########
[2025-02-24 10:28:44:791_S:] AT+QCOAPCFG="pdpcid",1,1
[2025-02-24 10:28:44:857_R:] AT+QCOAPCFG="pdpcid",1,1
[2025-02-24 10:28:44:857_R:] OK
[2025-02-24 10:28:45:374_S:] AT+QCOAPCFG="dtls",1,0
[2025-02-24 10:28:45:440_R:] AT+QCOAPCFG="dtls",1,0
[2025-02-24 10:28:45:440_R:] OK
[2025-02-24 10:28:45:998_S:] AT+QCOAPCFG="trans",1,60,5
[2025-02-24 10:28:46:058_R:] AT+QCOAPCFG="trans",1,60,5
[2025-02-24 10:28:46:058_R:] OK
[2025-02-24 10:29:05:088_S:] // ########## Open Connection ##########
[2025-02-24 10:29:07:454_S:] AT+QCOAPOPEN=0,"coap.thingsboard.cloud",5683
[2025-02-24 10:29:07:520_R:] AT+QCOAPOPEN=0,"coap.thingsboard.cloud",5683
[2025-02-24 10:29:07:520_R:] OK

[2025-02-24 10:29:09:053_R:] +QCOAPOPEN: 0,0
[2025-02-24 10:29:10:004_S:] AT+QCOAPHEADER=0,0,1
[2025-02-24 10:29:10:087_R:] AT+QCOAPHEADER=0,0,1
[2025-02-24 10:29:10:087_R:] OK
[2025-02-24 10:29:25:401_S:] // ########## Add options ##########
[2025-02-24 10:29:28:084_S:] AT+QCOAPOPTION=0,0,0,3,"coap.thingsboard.cloud"
[2025-02-24 10:29:28:151_R:] AT+QCOAPOPTION=0,0,0,3,"coap.thingsboard.cloud"
[2025-02-24 10:29:28:151_R:] OK
[2025-02-24 10:29:29:117_S:] AT+QCOAPOPTION=0,0,1,7,5683
[2025-02-24 10:29:29:184_R:] AT+QCOAPOPTION=0,0,1,7,5683
[2025-02-24 10:29:29:184_R:] OK
[2025-02-24 10:29:30:001_S:] AT+QCOAPOPTION=0,0,2,11,"api/v1/Lf3GbaryZzlKKQG6id2U/attributes"
[2025-02-24 10:29:30:068_R:] AT+QCOAPOPTION=0,0,2,11,"api/v1/Lf3GbaryZzlKKQG6id2U/attributes"
[2025-02-24 10:29:30:068_R:] OK
[2025-02-24 10:29:31:255_S:] AT+QCOAPOPTION=0,0,3,6,0
[2025-02-24 10:29:31:317_R:] AT+QCOAPOPTION=0,0,3,6,0
[2025-02-24 10:29:31:317_R:] OK
[2025-02-24 10:29:48:298_S:] // ########## Preset client options ##########
[2025-02-24 10:30:03:929_S:] AT+QCOAPOPTIOIN
[2025-02-24 10:30:03:995_R:] AT+QCOAPOPTIOIN
[2025-02-24 10:30:03:995_R:] ERROR
[2025-02-24 10:30:06:245_S:] AT+QCOAPOPTIOIN?
[2025-02-24 10:30:06:311_R:] AT+QCOAPOPTIOIN?
[2025-02-24 10:30:06:311_R:] ERROR
[2025-02-24 10:30:10:544_S:] AT+QCOAPOPTIOIN=?
[2025-02-24 10:30:10:611_R:] AT+QCOAPOPTIOIN=?
[2025-02-24 10:30:10:611_R:] ERROR
[2025-02-24 10:30:13:111_S:] AT+QCOAPOPTIOIN=0
[2025-02-24 10:30:13:177_R:] AT+QCOAPOPTIOIN=0
[2025-02-24 10:30:13:177_R:] ERROR
[2025-02-24 10:30:42:206_S:] AT+QGMR
[2025-02-24 10:30:42:273_R:] AT+QGMR
[2025-02-24 10:30:42:273_R:] BG77LAR02A04_01.204.01.204

[2025-02-24 10:30:42:273_R:] OK