Updating description in b64_encode and adding b64_decode. Updating README.md

Author: freol35241

README.md

@@ -36,7 +36,7 @@ The following are "recipes" for "run" commands that can be used with this image.
 
 * Injecting data from "any" source into a mqtt broker using the standard brefv format (examplified by a multicast stream). Every UDP packet gets base64-encoded and packaged into a brefv envelope and then published to the broker:
   ```
-  socat -u UDP4-RECVFROM:60002,reuseaddr,ip-add-membership=239.192.0.2:enp2s0,fork SYSTEM:'base64 --wrap=0' \
+  socat -u UDP4-RECVFROM:60002,reuseaddr,ip-add-membership=239.192.0.2:enp2s0,fork SYSTEM:echo $$(base64 --wrap=0) \
   | raw_to_brefv \
   | mosquitto_pub -l -t '<topic>'
   ```

bin/b64_decode

@@ -0,0 +1,11 @@
+#!/bin/bash
+
+# Command line utility tool for processing input from stdin. Each line on the
+# input stream is base64 decoded.
+
+set -euo pipefail
+
+while read -r line
+do
+  echo "$line" | base64 --decode
+done

bin/b64_encode

@@ -1,7 +1,7 @@
 #!/bin/bash
 
 # Command line utility tool for processing input from stdin. Each line on the
-# input stream base64 encoded with no wrapping and ended with a newline.
+# input stream is base64 encoded with no wrapping and ended with a newline.
 
 set -euo pipefail