The config can be redefined in cellular_config.h to support different modem prefix string format.

check_is_prefix_char_config

CELLULAR_CHECK_IS_PREFIX_CHAR

Macro to check prefix chars.

The macro to check prefix string contains valid char. Modem with different prefix strings can be supported with this config.

Default value (if undefined): alphabet, digit, '+' and '_'

For example:

‍+APP PDP: 0,ACTIVE

The prefix string contains space which is not default valid char. User can define this config to support this prefix string.

check_is_prefix_leading_char_config

CELLULAR_CHECK_IS_PREFIX_LEADING_CHAR

Macro to check prefix leading char.

Cellular interface requires prefix string starts with "+". Some cellular modem uses different leading char. This macro can be defined in cellular_config.h to support different leading char.

Default value (if undefined): '+'

For example:

‍^SMSO:(list of supported<fso>s)

The prefix string contains "^" which is not default leading char for prefix string. User can define this config to support this prefix string.