One solution could have used a separate set of "command pins" dedicated to sending and receiving commands, another could have used a signal pin indicating that the modem should interpret incoming data as a command.
Another could have used a signal pin indicating that the modem should interpret incoming data as a command. One solution could have used a separate set of "command pins" dedicated to sending and receiving commands.
One solution could have used a separate set of "command pins" dedicated to sending and receiving commands. Another could have used a signal pin indicating that the modem should interpret incoming data as a command.
One solution could have used a separate set of "command pins" dedicated to sending and receiving commands. Another could have used a signal pin indicating that the modem should interpret incoming data as a command.