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Workaround for race-condition

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This commit is contained in:
Ralf Schlatterbeck 2015-01-27 10:06:22 +01:00
parent c8be130f2e
commit 16afb4b74c
1 changed files with 13 additions and 2 deletions
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15
examples/osd/poti/poti.c
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@ -203,9 +203,20 @@ PROCESS_THREAD(poti, ev, data)
char buf [4];
coap_transaction_t *transaction;
sprintf (buf, "%d", val);
/*
* Note: A sending transaction may be still in progress when
* we call the following code. This means that the *new*
* value in the transaction buffer will overwrite the old
* value *but* the old length remains. This means if we
* first send 255 (and the transaction sending 255 is still
* in progress) and we now send 0, the resulting buffer is
* 055 (because only the 0 is copied but the old length
* stays). Therefore as a workaround we *always* send a
* 3-byte value.
*/
sprintf (buf, "%03d", val);
lastval = val;
printf ("Sending Value: %d\n", val);
printf ("Sending Value: %s\n", buf);
coap_init_message (request, COAP_TYPE_NON, COAP_PUT, 0);
coap_set_header_uri_path (request, server_resource);
coap_set_header_content_format (request, REST.type.TEXT_PLAIN);