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8edbac6974
Add error path to all CMUX protocol potential issues, checks for consistency and add recovery.
49 lines
2.5 KiB
Plaintext
49 lines
2.5 KiB
Plaintext
menu "esp-modem"
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config ESP_MODEM_CMUX_DEFRAGMENT_PAYLOAD
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bool "Defragment CMUX messages internally"
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default y
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help
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If enabled (default), the esp-modem automatically defragments CMUX messages
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to only pass the completed CMUX message to higher layers.
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This is useful for messages in command mode (if they're received fragmented).
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It's not a problem for messages in data mode as the upper layer (PPP protocol)
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defines message boundaries.
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Keep the default to true for most cases (as most devices use simply 1 byte CMUX
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length, as the internal Rx buffer of size >= 256 bytes won't overflow)
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Set to false if your devices uses 2 byte CMUX payload (e.g. A7672S).
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The operation would work without an issue in data mode, but some replies
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in command mode might come fragmented in rare cases so might need to retry
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AT commands.
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config ESP_MODEM_USE_INFLATABLE_BUFFER_IF_NEEDED
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bool "Use inflatable buffer in DCE"
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default n
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help
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If enabled we will process the ongoing AT command by growing the current
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buffer (if we've run out the preconfigured buffer).
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If disabled, we simply report a failure.
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Use this if additional allocation is not a problem and you need to reliably process
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all commands, usually with sporadically longer responses than the configured buffer.
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Could be also used to defragment AT replies in CMUX mode if CMUX_DEFRAGMENT_PAYLOAD=n
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config ESP_MODEM_CMUX_DELAY_AFTER_DLCI_SETUP
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int "Delay in ms to wait before creating another virtual terminal"
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default 0
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help
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Some devices might need a pause before sending SABM command that creates
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virtual terminal. This delay applies only to establishing a CMUX mode.
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The typical reason for failing SABM request without a delay is that
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some devices (SIM800) send MSC requests just after opening a new DLCI.
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config ESP_MODEM_CMUX_USE_SHORT_PAYLOADS_ONLY
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bool "CMUX to support only short payloads (<128 bytes)"
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default n
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help
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If enabled, the CMUX protocol would only use 1 byte size field.
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You can use this option for devices that support only short CMUX payloads
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to make the protocol more robust on noisy environments or when underlying
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transport gets corrupted often (for example by Rx buffer overflows)
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endmenu
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