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Modem - Common Functions
- MODEM_AtCommand -- Send AT command and get reply
- MODEM_CheckReply -- Check substring in the Reply string
- MODEM_GetErrorCode -- Get ErrorCode from the reply string
- MODEM_GetReply -- Get reply from modem
- MODEM_ReadByte -- Read a byte from modem
- MODEM_SendCommand -- Send AT command
- MODEM_WriteByte -- Write a byte to modem