Prevent setting COPS=0 on every connection to speed up#31
Prevent setting COPS=0 on every connection to speed up#31JohanEThomsen wants to merge 3 commits intotoitware:mainfrom
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Inspired by this article: |
| // with reset attempts. | ||
| if (attempts_ > CELLULAR_FAILS_UNTIL_SCAN) and (attempts_ % 3 == 0): | ||
| logger.info "scanning for operators" --tags={"attempt": attempts_} | ||
| operators := driver.scan_for_operators |
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So we ignore the returned operators, but we believe that doing the scan will somehow have a side-effect on the next automatic attempt?
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Yes that's the idea. It's not clearly described in the documentation, but our tests suggests that the scan updates the internal caches of modem's list of available operators, which then affects how it decides on a given operator in the subsequent automatic connect.
We have seen a device, which consistently kept re-choosing a network, where registration succeeded but the following PDP context activation failed, such that it never achieved a proper connection. After a couple of scans, it chose another operator and thus automatically achieved proper connection again.
However, it would be better to keep a flashed-back list of the used operators in the driver so we can prevent the situation completely (like the TODO comment suggests).
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