i’m started to develop a modem Wismo 228 recently. Use GPRS mode.
After switching to Continuous Transparent Mode with the command at + wipdata = 2,1,2 I am testing the transfer of bytes from 0x00 to 0xff.
As a result discovered the following problems:
When send byte 0x0D modem automatically adds the byte 0x0A
send: 0x0D -> receive: 0x0D 0x0A
When send byte 0x0F modem automatically duplicates the transmission
send: 0x0F -> receive: 0x0F 0x0F
If in the course of time more than 2 minutes there wasn’t an exchange then after the resumption of the transfer the first byte coming incorrect into the modem.
Has anyone come across these problems and how to solve them?
Best regards, ANDRIC