added listener example

Author: afdaniele

Dockerfile

@@ -19,6 +19,7 @@ RUN apt-get update && apt-get install -y \
     python-dev \
     unzip \
     net-tools \
+    nano \
     # clean the apt cache
     && rm -rf /var/lib/apt/lists/*
 
@@ -41,3 +42,4 @@ RUN echo 'net.core.rmem_default=10485760' >> /etc/sysctl.conf
 # copy, then build examples
 COPY assets/examples /root/examples
 RUN cd /root/examples/publisher; lcm-gen -p example_t.lcm
+RUN cd /root/examples/listener; lcm-gen -p example_t.lcm

assets/examples/listener/example_t.lcm

@@ -0,0 +1,7 @@
+package exlcm;
+struct example_t
+{
+    int64_t  timestamp;
+    string   name;
+    boolean  enabled;
+}

assets/examples/listener/main.py

@@ -0,0 +1,17 @@
+import lcm
+from exlcm import example_t
+
+
+def handler(channel, data):
+	msg = example_t.decode(data)
+	print 'Received msg: (%d, %s, %r)' % (msg.timestamp, msg.name, msg.enabled)
+
+
+lc = lcm.LCM()
+lc.subscribe("EXAMPLE", handler)
+
+try:
+	while True:
+		lc.handle()
+except KeyboardInterrupt:
+	pass