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			Switching back from data (PPP) mode to command mode must be done is the following sequence: * No characters entered for T1 time (1 second) * "+++" characters entered with no characters in between (1 second) * No characters entered for T1 timer (1 second) (per specification of SIM800 SIM800_Series_AT_Command_Manual_V1.09.pdf) Related https://github.com/espressif/esp-idf/issues/7608