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Allow to add Delay to CMUX DISC (IDFGH-15937) #604

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Allow to add Delay to CMUX DISC (IDFGH-15937) #604

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7 changes: 7 additions & 0 deletions components/esp_modem/Kconfig
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Original file line number Diff line number Diff line change
Expand Up @@ -36,6 +36,13 @@ menu "esp-modem"
The typical reason for failing SABM request without a delay is that
some devices (SIM800) send MSC requests just after opening a new DLCI.

config ESP_MODEM_CMUX_DELAY_AFTER_DLCI_DISCONNECT
int "Delay in ms to wait after closing virtual terminal"
default 0
help
Some devices might need a pause before sending disconnect command that closes
virtual terminal. This delay applies only to close DLCI in CMUX mode.

config ESP_MODEM_CMUX_USE_SHORT_PAYLOADS_ONLY
bool "CMUX to support only short payloads (<128 bytes)"
default n
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1 change: 1 addition & 0 deletions components/esp_modem/src/esp_modem_cmux.cpp
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Expand Up @@ -81,6 +81,7 @@ uint8_t CMux::fcs_crc(const uint8_t frame[6])

void CMux::send_disconnect(size_t i)
{
usleep(CONFIG_ESP_MODEM_CMUX_DELAY_AFTER_DLCI_DISCONNECT * 1'000);
if (i == 0) { // control terminal
uint8_t frame[] = {
SOF_MARKER, 0x3, 0xEF, 0x5, 0xC3, 0x1, 0xF2, SOF_MARKER
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