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Commit eec4167a authored by Rob Swindell's avatar Rob Swindell :speech_balloon:
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Implement write-retry in modem_send()

In attempt to address the "Error 11" (EAGAIN) error theat Nelgin sees when
configuring some longer modem init strings on Linux.

This is just a single retry (after a yield) after any modem command char
send failure (for any reason), including the terminating carriage-return.

See issue #662 to details.
parent 7116c52b
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