Simplifying MQTT handling

Cargo.lock

@@ -203,7 +203,6 @@ dependencies = [
 [[package]]
 name = "derive_miniconf"
 version = "0.1.0"
-source = "git+https://github.com/quartiq/miniconf.git?branch=feature/mqtt-removal#6b6b9d7973ac5b4771c211c775c51f82d4a7727f"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -416,10 +415,10 @@ dependencies = [
 [[package]]
 name = "miniconf"
 version = "0.1.0"
-source = "git+https://github.com/quartiq/miniconf.git?branch=feature/mqtt-removal#6b6b9d7973ac5b4771c211c775c51f82d4a7727f"
 dependencies = [
  "derive_miniconf",
  "heapless 0.6.1",
+ "minimq",
  "serde",
  "serde-json-core",
 ]

Cargo.toml

@@ -44,7 +44,7 @@ paste = "1"
 dsp = { path = "dsp" }
 ad9959 = { path = "ad9959" }
 generic-array = "0.14"
-miniconf = "0.1.0"
+miniconf = { version = "0.1.0", features = ["minimq-support"] }
 
 [dependencies.mcp23017]
 git = "https://github.com/mrd0ll4r/mcp23017.git"
@@ -55,8 +55,13 @@ features = ["stm32h743v", "rt", "unproven", "ethernet", "quadspi"]
 version = "0.9.0"
 
 [patch.crates-io.miniconf]
-git = "https://github.com/quartiq/miniconf.git"
-branch = "feature/mqtt-removal"
+path = "../miniconf"
+# git = "https://github.com/quartiq/miniconf.git"
+# branch = "feature/mqtt-removal"
+
+[patch.crates-io.minimq]
+git = "https://github.com/quartiq/minimq.git"
+rev = "933687c2e4b"
 
 [dependencies.smoltcp-nal]
 git = "https://github.com/quartiq/smoltcp-nal.git"

src/net/mod.rs

@@ -116,31 +116,10 @@ where
         // Handle any MQTT traffic.
         match self.mqtt.borrow_mut().poll(
             |client, topic, message, properties| {
-                // Find correlation-data and response topics.
-                let correlation_data = properties.iter().find_map(|prop| {
-                    if let minimq::Property::CorrelationData(data) = prop {
-                        Some(*data)
-                    } else {
-                        None
-                    }
-                });
-                let response_topic = properties.iter().find_map(|prop| {
-                    if let minimq::Property::ResponseTopic(topic) = prop {
-                        Some(*topic)
-                    } else {
-                        None
-                    }
-                });
-
-                let incoming = miniconf::Message {
-                    data: message,
-                    correlation_data,
-                    response_topic,
-                };
-
-                if let Some(response) =
-                    self.miniconf.borrow_mut().process(topic, incoming)
-                {
+                if let Some(response) = self.miniconf.borrow_mut().process(
+                    topic,
+                    miniconf::Message::from(message, properties),
+                ) {
                     let mut response_properties: Vec<
                         minimq::Property,
                         consts::U1,