Add MQTT module to STM32 pack

resources/I-CUBE-Mongoose/Cesanta.I-CUBE-Mongoose.pdsc

@@ -2,12 +2,13 @@
 <package schemaVersion="1.7.40" xmlns:xs="http://www.w3.org/2001/XMLSchema-instance" xs:noNamespaceSchemaLocation="PACK.xsd">
   <vendor>Cesanta</vendor>
   <name>I-CUBE-Mongoose</name>
-  <description>Mongoose - TCP/IP stack + TLS + HTTP + WebSocket + MQTT + Firmware OTA</description>
-  <url>https://mongoose.ws/</url>
+  <description>Mongoose - a lightweight networking library providing TCP/IP stack, TLS, HTTP (Embedded Web Server), WebSocket, MQTT, and Firmware OTA updates. Build production-ready web device dashboards and MQTT cloud connectivity without stitching multiple components together.
+  </description>
+  <url>https://mongoose.ws/downloads/stm32pack/</url>
   <license>License.txt</license>
   <supportContact>https://mongoose.ws/contact/</supportContact>
   <releases>
-    <release date="2026-04-22" version="7.21.3">See https://github.com/cesanta/mongoose/releases/tag/7.21</release>
+    <release date="2026-04-24" version="7.21.4">See https://github.com/cesanta/mongoose/releases/tag/7.21</release>
     <release date="2026-04-08" version="7.21.0">See https://github.com/cesanta/mongoose/releases/tag/7.21</release>
     <release date="2024-03-01" version="7.13.0">See https://github.com/cesanta/mongoose/releases/tag/7.13</release>
   </releases>
@@ -21,7 +22,7 @@
     </condition>
   </conditions>
   <components>
-    <component Cclass="Mongoose" Cgroup="Networking Core" Cversion="7.21.3" maxInstances="1">
+    <component Cclass="Mongoose" Cgroup="Networking Core" Cversion="7.21.4" maxInstances="1">
       <description>Networking Core</description>
       <files>
         <file category="header" name="mongoose.h" />
@@ -29,12 +30,18 @@
         <file category="header" name="mongoose_config.h"/>
       </files>
     </component>
-    <component Cclass="Mongoose" Cgroup="Web Device Dashboard" Cversion="7.21.3" condition="MongooseCore" maxInstances="1">
+    <component Cclass="Mongoose" Cgroup="Web Device Dashboard" Cversion="7.21.4" condition="MongooseCore" maxInstances="1">
       <description>Web Device Dashboard</description>
       <files>
         <file category="sourceC" name="mongoose_dashboard.c"/>
         <file category="sourceC" name="dashboard.html.c"/>
       </files>
     </component>
+    <component Cclass="Mongoose" Cgroup="MQTT Client" Cversion="7.21.4" condition="MongooseCore" maxInstances="1">
+      <description>MQTT Client</description>
+      <files>
+        <file category="sourceC" name="mongoose_mqtt.c"/>
+      </files>
+    </component>
   </components>
 </package>

resources/I-CUBE-Mongoose/Makefile

@@ -1,11 +1,10 @@
-VERSION = 7.21.3
+VERSION = 7.21.4
 REPO_ROOT = ../..
 FILES = Cesanta.I-CUBE-Mongoose.pdsc Release_Notes.html mongoose_config.h README.md
 GENERATED = License.txt \
             mongoose.h mongoose.c \
-            mongoose_dashboard.c dashboard.html.c
-        # STM32CubeMX/Cesanta.I-CUBE-Mongoose.$(VERSION)_Configs.xml \
-        # STM32CubeMX/Cesanta.I-CUBE-Mongoose.$(VERSION)_Modes.xml
+            mongoose_dashboard.c dashboard.html.c \
+            mongoose_mqtt.c dashboard.html.c
 
 all: Cesanta.I-CUBE-Mongoose.$(VERSION).pack
 
@@ -27,6 +26,9 @@ Mongoose:
 mongoose_dashboard.c:
 	cp $(REPO_ROOT)/tutorials/device-dashboard/mongoose_dashboard.c $@
 
+mongoose_mqtt.c:
+	cp $(REPO_ROOT)/tutorials/mqtt/mqtt-client/mongoose_mqtt.c $@
+
 dashboard.html.c:
 	make -C $(REPO_ROOT)/tutorials/device-dashboard dashboard.html.c
 	cp $(REPO_ROOT)/tutorials/device-dashboard/dashboard.html.c $@
@@ -37,11 +39,5 @@ mongoose.h: Mongoose
 mongoose.c: Mongoose
 	cp $(REPO_ROOT)/mongoose.c $@
 
-STM32CubeMX/Cesanta.I-CUBE-Mongoose.${VERSION}_Modes.xml:	STM32CubeMX/m.xml
-	sed s,__VERSION__,$(VERSION),g $^ > $@
-
-STM32CubeMX/Cesanta.I-CUBE-Mongoose.${VERSION}_Configs.xml:	STM32CubeMX/c.xml
-	sed s,__VERSION__,$(VERSION),g $^ > $@
-
 clean:
 	rm -rf *.pack STM32CubeMX/*.$(VERSION)_*.xml $(GENERATED)

resources/I-CUBE-Mongoose/README.md

@@ -101,6 +101,8 @@ Hi from Mongoose! Tick 38187
 
 ## Add full device dashboard
 
+Enable "Mongoose Web Device Dashboard" component in CubeMX. Regenerate code.
+
 Remove the hello world server if you added it. Modify your while loop
 to look like this:
 
@@ -119,3 +121,27 @@ while (1)
 
 Rebuild, reflash your board and enjoy the fully functional device dashboard
 that you can tailor to your firmware.
+
+## Add MQTT Client
+
+Enable "Mongoose MQTT Client" component in CubeMX. Regenerate code.
+
+Add MQTT init and poll to your while loop:
+
+```c
+/* USER CODE BEGIN WHILE */
+struct mg_mgr mgr;
+mg_mgr_init(&mgr);
+mg_mqtt_init(&mgr);
+
+while (1)
+{
+  mg_mgr_poll(&mgr, 1);
+  mg_mqtt_poll(&mgr);
+/* USER CODE END WHILE */
+```
+
+Rebuild, reflash your board. This MQTT Client connects to the
+HiveMQ public MQTT broker - see `mongoose_mqtt.c` file for details.
+Also it add a JSON-RPC "ota.update" function via MQTT, so you can
+update your firmware over MQTT, see https://mongoose.ws/mqtt/