start mqtt client (based on paho.mqtt.c), basically works

main.cpp

@@ -3,6 +3,7 @@
 #include "pidigest.h"
 #include "pihttpclient.h"
 #include "piliterals.h"
+#include "pimqttclient.h"
 #include "pip.h"
 #include "piunits.h"
 #include "pivaluetree_conversions.h"
@@ -18,8 +19,32 @@ inline PIByteArray SMBusTypeInfo_genHash(PIString n) {
 	return piSerialize(c.shorthash(n.removeAll(" "), PIString("SMBusDataHashKey").toByteArray()));
 }
 
+PIKbdListener kbd;
 
 int main(int argc, char * argv[]) {
+	PIMQTT::Client cl;
+	cl.setConnectTimeout(2_s);
+	CONNECTL(&cl, connected, [&cl] {
+		piCout << "connected";
+		cl.subscribe("/zigbee2mqtt");
+		cl.subscribe("/zigbee2mqtt/+");
+		cl.unsubscribe("/zigbee2mqtt");
+		cl.publish("/zigbee2mqtt/abc", "hello from PIP"_a.toAscii());
+	});
+	CONNECTL(&cl, disconnected, [&cl](PIMQTT::Error code) {
+		piCout << "disconnected code" << (int)code;
+		cl.connect("localhost", "PIP");
+	});
+	CONNECTL(&cl, received, [](const PIMQTT::Message & message) { piCout << "received" << message.topic << message.payload.size(); });
+
+	cl.connect("localhost", "PIP");
+
+	kbd.enableExitCapture('Q');
+	WAIT_FOR_EXIT
+
+	piCout << "exiting ...";
+	return 0;
+
 	PICrypt _crypt;
 	// auto ba = PIFile::readAll("logo.png");
 	PIString str    = "hello!"_a;