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SIM900_AT Commands Manual_V1.07 187 2012.12.10

2) For multi IP connection (+CIPMUX=1)

+CIPSEND: <0-7>,<length>

Parameters

See Write Command

Response

1) For single IP connection (+CIPMUX=0)

+CIPSEND: <size>

2) For multi IP connection (+CIPMUX=1)

+CIPSEND: <n>,<size>

Read Command

AT+CIPSEND?

Parameters

<n> A numeric parameter which indicates the connection number

<size> A numeric parameter which indicates the data length sent at

a time

Write Command

1) If single IP

connection

(+CIPMUX=0)

AT+CIPSEND=<

length>

2) If multi IP

connection

(+CIPMUX=1)

AT+CIPSEND=<

n>[,<length>]

Response

This Command is used to send changeable length data

If single IP is connected (+CIPMUX=0)

If connection is not established or module is disconnected:

If error is related to ME functionality:

+CME ERROR <err>

If sending is successful:

When +CIPQSEND=0

SEND OK

When +CIPQSEND=1

DATA ACCEPT: <length>

If sending fails:

SEND FAIL

If multi IP connection is established (+CIPMUX=1)

If connection is not established or module is disconnected:

If error is related to ME functionality:

+CME ERROR <err>

If sending is successful:

When +CIPQSEND=0

<n>,SEND OK

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