How to set VintageNetMobile service_provider.apn from ICCID

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This turned out to be sort of easy. The solution was to,

  • Remove the PPPDConfig.add_child_spec from the modem driver add_raw_config/3 definition.
  • Use PowerManager to handle the modem power-on + watchdog.
  • Have the modem driver handle AT commands for modem config, setup, etc.
  • Once the modem driver is happy with a ready modem, it initiates the PPPD child process.

So the change mostly boils down to, move the PPPD child from being a child of VintageNetMobile and at the same level as the modem driver, to a child of the modem driver.

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