curl --location --request POST '/api/v1/mqtt/api/v5/clients//unsubscribe/bulk' \
--header 'Ithings-Project-Id: {{Ithings-Project-Id}}' \
--header 'Ithings-Token: {{iThings-token}}' \
--header 'app-code: {{appCode}}' \
--header 'device-id;'
{
"code": "200",
"msg": "string"
}