The image_parser's index.js code fails to create a Buffer from the message data. Error is:

TypeError: First argument must be a string, Buffer, ArrayBuffer, Array, or array-like object. at Function.Buffer.from (buffer.js:183:11) at exports.imageParser (/srv/index.js:13:23) at /worker/worker.js:825:24 at <anonymous> at process._tickDomainCallback (internal/process/next_tick.js:229:7)

This prevents data from being processed by the vision API and written to BigTable.