Upgrading to 0.8.0-rc7 has made it so our units no longer stay connected when booted off the power supply. We are using a 5V supply rated well in excess of 5A.
They boot and stay connected fine when a battery is plugged in, but without the battery on the first boot they do not stay connected. What’s weird is that they do complete the handshake and deliver an initial diagnostics message (we can see it in the console), but then they go silent and become unreachable. The cyan LED starts blinking rapidly.
It’s also weird that the battery can be removed and then the Electron rebooted without reproducing this problem. It really is only on initial power-on.
This problem was seen across several tested devices. Using
particle device doctor to downgrade to 0.7.0 solves the problem. Have not tested other 0.8.0 RCs.
This occurs whether the firmware was compiled for 0.7.0 or 0.8.0-rc4 (-rc7 is not available right now as an option in Particle Dev).
This is using a 3rd party AT&T SIM, with KeepAlive set at 60 seconds.
This is an absolute blocker for us for 0.8.0.