Mqtt notes - Revision history

Ted: Add link to AWS policy set up instructions and Greengrass resources, Python MQTT support.

2025-01-15T22:52:30Z

Add link to AWS policy set up instructions and Greengrass resources, Python MQTT support.

Ted: Add section "AWS CLI with Python for MQTT".

2025-01-15T22:48:09Z

Add section "AWS CLI with Python for MQTT".

Ted: Add link to MQTT Last Will and Testament.

2024-10-24T22:04:44Z

Add link to MQTT Last Will and Testament.

Ted: /* ^ successful publish to hello/world topic */ nrf/ext/curl/lib/mqtt.c

2021-12-22T00:59:10Z

^ successful publish to hello/world topic: nrf/ext/curl/lib/mqtt.c

Ted: /* ^ Tau and AT, iDRX and cDRX parameters */

2021-12-22T00:21:44Z

^ Tau and AT, iDRX and cDRX parameters

Ted: /* ^ Tau and AT, iDRX and cDRX parameters */

2021-12-21T23:45:18Z

^ Tau and AT, iDRX and cDRX parameters

Ted: /* ^ Tau and AT, iDRX and cDRX parameters */

2021-12-21T23:28:21Z

^ Tau and AT, iDRX and cDRX parameters

Ted: /* ^ Tau and AT, iDRX and cDRX parameters */ nRF9160 disconnects after 4-5 minutes when keep alive time is 60

2021-12-21T23:24:44Z

^ Tau and AT, iDRX and cDRX parameters: nRF9160 disconnects after 4-5 minutes when keep alive time is 60

Ted: /* ^ Tau and AT, iDRX and cDRX parameters */ - 3GPP document.

2021-12-21T21:45:54Z

^ Tau and AT, iDRX and cDRX parameters: - 3GPP document.

Ted: Nordic Devzone help and reference to LTE modem parameters TAU, AT, iDRX, cDRX, RRC idle.

2021-12-21T19:57:52Z

Nordic Devzone help and reference to LTE modem parameters TAU, AT, iDRX, cDRX, RRC idle.

@@ Line 341: / Line 341: @@
 A technical post on Dev.to site, relating to AWS and Python scripting to support MQTT testing:
+<ul>
 *  https://dev.to/aws-builders/aws-iot-pubsub-over-mqtt-1oig
+</ul>
 <!-- odne komentar -->

← Older revision		Revision as of 22:48, 15 January 2025
Line 335:		Line 335:

	* https://www.hivemq.com/blog/mqtt-essentials-part-9-last-will-and-testament/		* https://www.hivemq.com/blog/mqtt-essentials-part-9-last-will-and-testament/
		+
		+	<!-- odne komentar -->
		+
		+	== [[#top\|^]] AWS CLI with Python for MQTT ==
		+
		+	A technical post on Dev.to site, relating to AWS and Python scripting to support MQTT testing:
		+
		+	* https://dev.to/aws-builders/aws-iot-pubsub-over-mqtt-1oig
		+
		+	<!-- odne komentar -->

← Older revision		Revision as of 22:04, 24 October 2024
Line 330:		Line 330:
	161 MQTT_CLIENTID_LEN - clen + 1);		161 MQTT_CLIENTID_LEN - clen + 1);
	</pre>		</pre>
		+
		+
		+	== MQTT LWT ==
		+
		+	* https://www.hivemq.com/blog/mqtt-essentials-part-9-last-will-and-testament/

← Older revision		Revision as of 00:59, 22 December 2021
Line 272:		Line 272:

	RRC mode: Idle		RRC mode: Idle
		+	</pre>
		+
		+
		+	== edit point ==
		+
		+	2021-12-21 Note: parameter `aws_iot_config *const config` can be as the value NULL:
		+
		+	<pre>
		+	989 static int connect_client(struct aws_iot_config *const config)
		+	990 {
		+	991 int err;
		+	992
		+	993 err = client_broker_init(&client);
		+	994 if (err) {
		+	995 LOG_ERR("client_broker_init, error: %d", err);
		+	996 return err;
		+	997 }
		+	998
		+	999 err = mqtt_connect(&client);
		+	1000 if (err) {
		+	1001 LOG_ERR("mqtt_connect, error: %d", err);
		+	1002 err = connect_error_translate(err);
		+	1003 return err;
		+	1004 }
		+	1005
		+	1006 if (IS_ENABLED(CONFIG_AWS_IOT_SEND_TIMEOUT)) {
		+	1007 struct timeval timeout = {
		+	1008 .tv_sec = CONFIG_AWS_IOT_SEND_TIMEOUT_SEC
		+	1009 };
		+	</pre>
		+
		+
		+	and in file [west_workspace]/nrf/ext/curl/lib/mqtt.c . . .
		+
		+	<pre>
		+	140 static CURLcode mqtt_connect(struct connectdata *conn)
		+	141 {
		+	142 CURLcode result = CURLE_OK;
		+	143 const size_t client_id_offset = 14;
		+	144 const size_t packetlen = client_id_offset + MQTT_CLIENTID_LEN;
		+	145 char client_id[MQTT_CLIENTID_LEN + 1] = "curl";
		+	146 const size_t clen = strlen("curl");
		+	147 char packet[32] = {
		+	148 MQTT_MSG_CONNECT, /* packet type */
		+	149 0x00, /* remaining length */
		+	150 0x00, 0x04, /* protocol length */
		+	151 'M','Q','T','T', /* protocol name */
		+	152 0x04, /* protocol level */
		+	153 0x02, /* CONNECT flag: CleanSession */
		+	154 0x00, 0x3c, /* keep-alive 0 = disabled */
		+	155 0x00, 0x00 /* payload1 length */
		+	156 };
		+	157 packet[1] = (packetlen - 2) & 0x7f;
		+	158 packet[client_id_offset - 1] = MQTT_CLIENTID_LEN;
		+	159
		+	160 result = Curl_rand_hex(conn->data, (unsigned char *)&client_id[clen],
		+	161 MQTT_CLIENTID_LEN - clen + 1);
	</pre>		</pre>

@@ Line 30: / Line 30: @@
 A little further along with references to 3GPP Specification 27.007, and definition of User Equipment (UE):
 *  https://infocenter.nordicsemi.com/pdf/nrf91_at_commands_v1.4.1.pdf
 <!-- comentario -->

@@ Line 28: / Line 28: @@
 *  https://www.3gpp.org/component/itpgooglesearch/search?gsquery=UE
 </ul>
 <!-- comentario -->

@@ Line 26: / Line 26: @@
 <ul>
 *  https://www.3gpp.org/technologies/keywords-acronyms/98-lte
 </ul>

@@ Line 20: / Line 20: @@
 In response to post on Nordic Devzone:
 <ul>
 *  https://devzone.nordicsemi.com/power/w/opp/4/user-guide-lte
 </ul>

@@ Line 1: / Line 1: @@
 Notes on MQTT
@@ Line 10: / Line 12: @@
 </ul>
+*
 </ul>