Thanks rfrederick!

(greater than the number of configured externals) - I'm not sure why I was
using the value from the node.dab here, but it wasn't necessary so using local
variable now instead.

Previously, the error message was 32 bytes, plus the null... which doesn't
fit into a 32-byte buffer very well.

- configurable via [modem] CmdRetry, default value is 2 retries
- drops DTR, delays and the raises DTR before retrying modem commands
Improved log output:
- don't log COM Device value when passed live com handle/descriptor on cmdline
- log COM Device value in modem command/response errors
- more debug-related log output
Fix modem re-initialization time-out (off by one)
- ReInit value of 1 would result in reinit every 2 minutes of inactivity

back into the container because str_list_t's tend to realloc()