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Avoid unnecessary timeout when receiving "SEND FAIL" response from SIM7000 modem #750

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Add support for "SEND FAIL" response from SIM7000 modem

Without this change the transmission pauses for 1 second when "SEND FAIL" is received from the modem as the code ends up in the unhandled case in waitResponse() after the default 1 second timeout. This significantly reduces the possible throughput.

Add support for "SEND FAIL" response from SIM7000 modem
@Gelemikke Gelemikke changed the title Update TinyGsmClientSIM7000.h Add support for "SEND FAIL" response from SIM7000 modem Sep 1, 2023
@Gelemikke Gelemikke changed the title Add support for "SEND FAIL" response from SIM7000 modem Avoid unnecessary timeout when receiving "SEND FAIL" response from SIM7000 modem Mar 6, 2024
Allows checking if the change baud rate command was correctly received by the modem and helps avoiding mismatch in baud rate
The function implementation is more or less a copy from the SIM7000 function as the same command is supported by both modems
add getNetworkSystemMode() for SIM7600
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