esphome / esphome/feature-requests

sim800l add pdu mode

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Description

**Describe the problem you have/What new integration you would like**
In the current sim800l, it is not possible to send SMS in languages ​​other than English. If you send or receive a non-English SMS, the text will be displayed in hexadecimal format.

**Please describe your use case for this integration and alternatives you've tried:**
this doc : http://www.sendsms.cn/download/SMS_PDU-mode.PDF
maybe it could help.

**Additional context**
nedd add "AT+CMGF=0" for Turn on PDU mode , "AT+CMGF=1" for Turn on text mode.

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