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What is the reason why FT4232 returns data when sending?

Cause analysis of return value error: operator definition error, sending failure or system unhandled.

Solution: User-defined error, SMS sending failed. If you miss the case, you can contact Sixuntong Customer Service Center to check and locate the problem in batches and assist in handling it.

The applicable protocols for short message return value: SMPP, CMPP 1.2, CNGP 2.0, SMGP 3.0, SGIP 1.2, MISC, SPMS, SMIAS 1.2, SMIAS 2.5, SMGP 1.2.