base-modem: explicitly say if NET or TTY data ports are supported

A modem that creates exclusively bearer objects that work with NET
ports (e.g. all QMI or MBIM modems) must not add any TTY port in the
list of data ports.

A modem that creates exclusively bearer objects that work with TTY
ports (e.g. the generic modem) must not add any NET port in the
list of data ports.

A modem that may use both TTY and NET ports should add all in the list
of data ports.

Fixes https://gitlab.freedesktop.org/mobile-broadband/ModemManager/-/issues/324
Fixes https://gitlab.freedesktop.org/mobile-broadband/ModemManager/-/issues/329

plugins/simtech/mm-broadband-modem-qmi-simtech.c

@@ -55,6 +55,9 @@ mm_broadband_modem_qmi_simtech_new (const gchar  *device,
                          MM_BASE_MODEM_PLUGIN,     plugin,
                          MM_BASE_MODEM_VENDOR_ID,  vendor_id,
                          MM_BASE_MODEM_PRODUCT_ID, product_id,
+                         /* QMI modem supports NET only */
+                         MM_BASE_MODEM_DATA_NET_SUPPORTED, TRUE,
+                         MM_BASE_MODEM_DATA_TTY_SUPPORTED, FALSE,
                          MM_BROADBAND_MODEM_INDICATORS_DISABLED, TRUE,
                          NULL);
 }

plugins/simtech/mm-broadband-modem-simtech.c

@@ -1215,6 +1215,9 @@ mm_broadband_modem_simtech_new (const gchar *device,
                          MM_BASE_MODEM_PLUGIN, plugin,
                          MM_BASE_MODEM_VENDOR_ID, vendor_id,
                          MM_BASE_MODEM_PRODUCT_ID, product_id,
+                         /* Generic bearer supports TTY only */
+                         MM_BASE_MODEM_DATA_NET_SUPPORTED, FALSE,
+                         MM_BASE_MODEM_DATA_TTY_SUPPORTED, TRUE,
                          MM_BROADBAND_MODEM_INDICATORS_DISABLED, TRUE,
                          NULL);
 }