I am receiving a
+KTCP_NOTIF: 1,8after transmitting TCP data. (Data sending is OK but +KTCPSND was waiting for more or less characters). Because of this, I do not know how many bytes the server is sending back to me, because I don’t get a +KTCP_DATA response.
Legato RTOS: 18.09.2.ALT1250.rc5 2019/04/04 14:02:47
13866 bytes of data to a server using TCP. I have 3 data components concatenated together:
TCP Header, some pre-data, and data:
POST <IP-ADDRESS-ENDPOINT> HTTP/1.1<CR><LF> Host: <IP-ADDRESS><CR><LF> Content-Length: 13750<CR><LF> (NOTE: Total Size - TCP header size) Content-Type: application/octet-stream<CR><LF> <CR><LF> [object][data]--EOF--Pattern--
The total size of this data (up to but not including
--EOF--Pattern--) in this example is
My general connection flow is as follows:
AT+K3 AT+CGDCONT=1,"IPV4V6","internet.sierrawireless.com" --> Receive OK AT+KCNXCFG=1,"GPRS","internet.sierrawireless.com" --> Receive OK AT+KTCPCFG=1,0,"<IP_ADDRESS>",80 --> Receive +KTCPCFG: 1 AT+KTCPCNX=1 --> Receive +KCNX_IND: 1,1,0 (Connecting...) --> Receive +KTCP_IND: 1,1 (Connected)
Each command has 200 msec of delay after receiving a response, and before transmitting the next command. After receiving connect
KTCP_IND: 1,1, I issue
AT+KTCPSND=1,13866200 msec later. I then wait for “
CONNECT”. After receiving “
CONNECT”, I start sending data to the UART.
[200 msec delay]
--> Receive CONNECT
13866 bytes of data] (Have also tried with additional delays after
- I verify with a logic analyzer that after “
CONNECT”, the EXACT number of bytes (
13866) are sent to the radio after
CONNECTand up to but not including
- I verify the baud rate is correct (115200 +/- 1%)
- Hardware flow control is enabled, and TX data (into the module) is being properly delayed when CTS is asserted.
- I continue to run this example, and on occasion, the radio will respond with “+KTCP_DATA: 1,<bytes_to_receive>”
Any ideas how I should approach this? Is there a way to query the module for how many bytes it received?
Appreciate any feedback anyone may have.
Other threads I have read: