GPRSBee R7 pin 12 doesn't indicate status by expected time

[SRGDamia1]

Actually, not by expected time (2s) plus a nearly 2s of fudge. Is it even wired up?

See conversations here: #252

[aufdenkampe]

For close-up photos of the two GPRSBee versions -- Rev. 6b & Rev. 7b -- see #252 (comment).

[fisherba]

So.. I went back to
const int8_t modemStatusPin = 19;
on Rev7 modem at the status pin check commit:
https://github.com/EnviroDIY/ModularSensors.git#3b9142315a7801b3bc595ef10ec79d6041df4093
And modem status works. I think that's good news. I no longer need the pin on -1 for the Rev7 modem to work.

In summary we have the following combinations all working successfully after the status pin check commit (all of my other tests were prior to that commit):
Mayfly v5 + GPRSBeeR6b
Mayfly v5b + GPRSBeeR6b
Mayfly v5 + GPRSBeeR7
Mayfly v5b + GPRSBeeR7
(and it doesn't work with the LTE adapter, but it shouldn't as far as I understand)

[fisherba]

Here's a debug with Mayfly v5b + GPRSBeeR7 combination with
const int8_t modemStatusPin = 19;
on Rev7 modem at the status pin check commit:
https://github.com/EnviroDIY/ModularSensors.git#3b9142315a7801b3bc595ef10ec79d6041df4093

It works overall, but the first modem status didn't work, which was a replicatable result.

modem_log_baf_20190530d.txt