ESP8266: Pelion connect fails with scanf(...)

[ccli8]

Description

Environment

mbed-os-example-pelion
656809a Merge pull request #14 from ARMmbed/remove-patches

mbed-clout-client
3.4.0

mbed-os
83fca60 Merge pull request #11454 from Tharazi97/LSI_VALUE_STM

Target
NUMAKER_IOT_M263A

Related PR

#11459

During my pelion test, I find something wrong with esp8266 driver. For my trace, I add printf(...) calls in:

mbed-os/components/wifi/esp8266-driver/ESP8266/ESP8266.cpp > ESP8266::_oob_packet_hdlr():

if (_tcp_passive && _sock_i[id].open == true && _sock_i[id].proto == NSAPI_TCP) {
        if (_parser.scanf("%d\n", &amount)) {
            _sock_i[id].tcp_data_avbl = amount;

            
            //TESTTEST
            printf("MYCHECK: TCP: amount: %d\r\n", amount);
            

            // notify data is available
            if (_callback) {
                _callback();
            }
        }
        return;
    } else if (!_parser.scanf("%d:", &amount)) {
        return;
    }

    
    //TESTTEST
    printf("\r\nMYCHECK: UDP: amount: %d\r\n\r\n", amount);
    

Pelion connect fails:

Mbed Bootloader
No Update image
[DBG ] Active firmware up-to-date
booting...

Initialize KVStore
Connect to network
Network connected with IP 192.168.8.107

Start developer flow
Create resources
Register Pelion Device Management Client


MYCHECK: UDP: amount: 109

MYCHECK: TCP: amount: 7
MYCHECK: TCP: amount: 9
client_error(6) -> Client in reconnection mode NetworkError
MYCHECK: TCP: amount: 7
MYCHECK: TCP: amount: 9
client_error(6) -> Client in reconnection mode NetworkError

MYCHECK: UDP: amount: 109

MYCHECK: TCP: amount: 7
MYCHECK: TCP: amount: 9
client_error(6) -> Client in reconnection mode NetworkError
MYCHECK: TCP: amount: 7
MYCHECK: TCP: amount: 8

If I change one scanf() back to recv():

mbed-os/components/wifi/esp8266-driver/ESP8266/ESP8266.cpp > ESP8266::_oob_packet_hdlr():

if (_tcp_passive && _sock_i[id].open == true && _sock_i[id].proto == NSAPI_TCP) {
        if (_parser.recv("%d\n", &amount)) {
            _sock_i[id].tcp_data_avbl = amount;

Pelion connect succeeds:

Mbed Bootloader
No Update image
[DBG ] Active firmware up-to-date
booting...

Initialize KVStore
Connect to network
Network connected with IP 192.168.8.107

Start developer flow
Create resources
Register Pelion Device Management Client


MYCHECK: UDP: amount: 109

MYCHECK: TCP: amount: 755
MYCHECK: TCP: amount: 186
MYCHECK: TCP: amount: 43
MYCHECK: TCP: amount: 811
MYCHECK: TCP: amount: 1046
MYCHECK: TCP: amount: 59
MYCHECK: TCP: amount: 60
MYCHECK: TCP: amount: 1065
MYCHECK: TCP: amount: 553
MYCHECK: TCP: amount: 549
MYCHECK: TCP: amount: 482
MYCHECK: TCP: amount: 42
MYCHECK: TCP: amount: 32
MYCHECK: TCP: amount: 25
MYCHECK: TCP: amount: 48

MYCHECK: UDP: amount: 106

MYCHECK: TCP: amount: 96
MYCHECK: TCP: amount: 744
MYCHECK: TCP: amount: 925
MYCHECK: TCP: amount: 43
MYCHECK: TCP: amount: 32
MYCHECK: TCP: amount: 32
MYCHECK: TCP: amount: 106
MYCHECK: TCP: amount: 141
Client registered.
Account ID: 015e5bd6c70c02420a01140500000000
Endpoint name: 016d4d8a204b000000000001001002de
Device ID: 016d4d8a204b000000000001001002de

Issue request type

[ ] Question
[ ] Enhancement
[x] Bug

[0xc0170]

@dmaziec1 Please review

cc @ARMmbed/mbed-os-ipcore

[michalpasztamobica]

@ccli8 , thanks for reporting!
Somehow, we haven't seen this with K64F tests and CI hasn't noticed anything before the merge, but we will look into this and try to figure out a fix.

[ciarmcom]

Internal Jira reference: https://jira.arm.com/browse/MBOCUSTRIA-1790

[ccli8]

Fixed via #11541