Added connectivity issue troubleshooting steps

Author: doctordaemon

Dockerfile.debian.byoc

@@ -59,7 +59,8 @@ RUN apt-get update && \
     nmap \
     gdb \
     libc6-dbg \
-    coreutils && \
+    coreutils \
+    procps && \
     rm -rf /var/lib/apt/lists/*
 
 RUN mkdir -p /opt/izuma

Dockerfile.debian.dev

@@ -60,7 +60,8 @@ RUN apt-get update && \
     nmap \
     gdb \
     libc6-dbg \
-    coreutils && \
+    coreutils \
+    procps && \
     rm -rf /var/lib/apt/lists/*
 
 RUN mkdir -p /opt/izuma

README.md

@@ -531,3 +531,59 @@ sudo lsof -i :8080
 Solutions:
 - Remove that other program using that same port.
 - Start mbed-edge to a different port than 8080 (`bin/mbed-edge --http-port <int>``).
+
+### Connectivity issues
+
+```sh
+$ dig tcp-lwm2m.us-east-1.mbedcloud.com +short
+
+dns-lb-lwm2m-production.us-east-1.mbedcloud.com.
+
+$ dig udp-lwm2m.us-east-1.mbedcloud.com +short
+
+dns-lb-lwm2m-production.us-east-1.mbedcloud.com.
+
+$ dig tcp-bootstrap.us-east-1.mbedcloud.com +short
+
+dns-lb-bootstrap-production.us-east-1.mbedcloud.com.
+
+$ dig udp-bootstrap.us-east-1.mbedcloud.com +short
+
+dns-lb-bootstrap-production.us-east-1.mbedcloud.com.
+
+# Time to resolve the DNS from within the container
+$ dig tcp-lwm2m.us-east-1.mbedcloud.com | grep Query
+
+;; Query time: 116 msec
+
+# Round-Trip Time between edge-core and firmware update S3 bucket 
+$ ping -c 5 firmware-catalog-media-ca57.s3.dualstack.us-east-1.amazonaws.com
+
+PING s3-r-w.dualstack.us-east-1.amazonaws.com (52.217.224.154) 56(84) bytes of data.
+64 bytes from s3-us-east-1-r-w.amazonaws.com (52.217.224.154): icmp_seq=1 ttl=63 time=93.8 ms
+64 bytes from s3-us-east-1-r-w.amazonaws.com (52.217.224.154): icmp_seq=2 ttl=63 time=86.7 ms
+64 bytes from s3-us-east-1-r-w.amazonaws.com (52.217.224.154): icmp_seq=3 ttl=63 time=95.3 ms
+64 bytes from s3-us-east-1-r-w.amazonaws.com (52.217.224.154): icmp_seq=4 ttl=63 time=87.0 ms
+64 bytes from s3-us-east-1-r-w.amazonaws.com (52.217.224.154): icmp_seq=5 ttl=63 time=88.6 ms
+
+--- s3-r-w.dualstack.us-east-1.amazonaws.com ping statistics ---
+5 packets transmitted, 5 received, 0% packet loss, time 4009ms
+rtt min/avg/max/mdev = 86.660/90.286/95.333/3.587 ms
+
+# Check HTTP connectivity and response time
+$ curl -o /dev/null -s -w \
+"DNS: %{time_namelookup}s\nConnect: %{time_connect}s\nTTFB: %{time_starttransfer}s\nTotal: %{time_total}s\n" \
+http://firmware-catalog-media-ca57.s3.dualstack.us-east-1.amazonaws.com
+
+DNS: 0.103582s
+Connect: 0.196595s
+TTFB: 0.299006s
+Total: 0.299089s
+
+# Validate download works using curl
+$ curl -O <Fimrware_image_url>
+
+# Packet capture
+tcpdump -vvv -i any "(port 5684 or port 443)" -w coap-and-tls.pcap
+
+```