avr - Can't update data to ThingSpeak using sim900c and atmega16 -


i can update data on thingspeak using sim800c computer (usb-ttl). but, can't update data when use atmega16 (usart). code:

usart_string_tx("at+cipstart=tcp,api.thingspeak.com,80\r"); _delay_ms(3000); _delay_ms(3000); _delay_ms(1000); usart_string_tx("at+cipsend\r"); _delay_ms(2000); usart_string_tx(apikey); usart_string_tx(data); usart_char_tx('\r'); _delay_ms(3000); while ( !( ucsra & (1<<udre))) {}; udr=(26); _delay_ms(500); usart_char_tx('\r'); _delay_ms(3000); _delay_ms(3000); usart_string_tx("at+cipshut\r");.

please me. i'm sorry.my english bad


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