Particle Dev: Build didn't produce binary Error

[ScruffR]

Just as a side note about String and Particle.variable()

Photon command line build failure

Have a look here Particle Firmware Updates Thread Help creating STRING variables It never was a good idea to use a String object for a Particle.variable() since the actual stored string might get relocated causing the “link” between the string and the Particle.variable() to break. Before you weren’t warned about the risk, but it would have happened. Now you get told beforehand that this may break your code and hence will not build. Sorry I must be reading over it, where is the spelling mis…

Even if it works at some point it might stop working under some circumstances and errors like that are a hell of a job to find.