Update send_wait_time text to reflect modbus timing changes

exciton commented 1 month ago

Documentation update to reflect change in how send_wait_time is handled in modbus.

Previously send_wait_time had to be set to the longest possible message on the bus, which is difficult to calculate, and error prone. It would clobber incoming messages by sending outgoing commands in the middle of receipt.

New functionality changes this to wait for the response to be complete, and then sending the next command.

Now send_wait_time only needs to be large enough to allow time for devices to send their first byte of response.

Description:

Related issue (if applicable): fixes

Pull request in esphome with YAML changes (if applicable): esphome/esphome#7674

Checklist:

[X] I am merging into next because this is new documentation that has a matching pull-request in esphome as linked above.
or
[ ] I am merging into current because this is a fix, change and/or adjustment in the current documentation and is not for a new component or feature.
[ ] Link added in /index.rst when creating new documents for new components or cookbook.

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exciton commented 2 weeks ago

@jesserockz - this relates to PR #7674 which is already merged

esphome / esphome-docs